10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

(Mark One)

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2011

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission file number: 1-12110

CAMDEN PROPERTY TRUST

(Exact name of registrant as specified in its charter)

Texas	76-6088377
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
3 Greenway Plaza, Suite 1300 Houston, Texas	77046
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (713) 354-2500

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Shares of Beneficial Interest, $.01 par value	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  x    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act (check one):

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in the Rule 12b-2 of the Act).    Yes  ¨     No  x

The aggregate market value of voting and non-voting common equity held by non-affiliates of the registrant was $4,418,001,069 based on a June 30, 2011 share price of $63.62.

On February 10, 2012, 78,804,181 common shares of the registrant were outstanding, net of treasury shares and shares held in our deferred compensation arrangements.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant's Proxy Statement in connection with its Annual Meeting of Shareholders to be held May 11, 2012 are incorporated by reference in Part III.

TABLE OF CONTENTS

		Page
PART I
Item 1.	Business		1
Item 1A.	Risk Factors		3
Item 1B.	Unresolved Staff Comments		10
Item 2.	Properties		10
Item 3.	Legal Proceedings		15
Item 4.	Mine Safety Disclosures		15
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities		16
Item 6.	Selected Financial Data		18
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		19
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk		38
Item 8.	Financial Statements and Supplementary Data		39
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure		39
Item 9A.	Controls and Procedures		39
Item 9B.	Other Information		42
PART III
Item 10.	Directors, Executive Officers and Corporate Governance		42
Item 11.	Executive Compensation		42
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters		42
Item 13.	Certain Relationships and Related Transactions, and Director Independence		43
Item 14.	Principal Accounting Fees and Services		43
PART IV
Item 15.	Exhibits and Financial Statement Schedules		44
SIGNATURES			51

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PART I

Item 1. Business

General

Formed on May 25, 1993, Camden Property Trust, a Texas real estate investment trust (“REIT”), is primarily engaged in the ownership, management, development, acquisition, and construction of multifamily apartment communities. Unless the context requires otherwise, “we,” “our,” “us,” and the “Company” refer to Camden Property Trust and its consolidated subsidiaries. Our multifamily apartment communities are referred to as “communities,” “multifamily communities,” “properties,” or “multifamily properties” in the following discussion.

Our corporate offices are located at 3 Greenway Plaza, Suite 1300, Houston, Texas 77046 and our telephone number is (713) 354-2500. Our website is located at www.camdenliving.com. On our website we make available free of charge our annual, quarterly, and current reports, and amendments to such reports, filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission (the “SEC”). We also make available, free of charge on our website, our Guidelines on Governance, Code of Business Conduct and Ethics, Code of Ethical Conduct for Senior Financial Officers, and the charters of each of our Audit, Compensation, Nominating, and Corporate Governance Committees.

Our annual, quarterly, and current reports, proxy statements, and other information are electronically filed with the SEC. You may read and copy any materials we file with the SEC at the SEC’s Public Reference Room at 100 F Street, NE, Washington, D.C. 20549. Please contact the SEC at 1-800-SEC-0330 for further information about the operation of the SEC’s Public Reference Room. The SEC also maintains a website at www.sec.gov which contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

Financial Information about Segments

We are primarily engaged in the ownership, management, development, acquisition, and construction of multifamily apartment communities. As each of our communities has similar economic characteristics, residents, amenities, and services, our operations have been aggregated into one reportable segment. See our consolidated financial statements and notes included thereto in Item 15 of this Annual Report on Form 10-K for certain information required by Item 1.

Narrative Description of Business

As of December 31, 2011, we owned interests in, operated, or were developing 206 multifamily properties comprising 69,794 apartment homes across the United States. Of these 206 properties, ten properties were under development and when completed will consist of a total of 2,797 apartment homes. In addition, we own land parcels we may develop into multifamily apartment communities.

Operating and Business Strategy

We believe producing consistent earnings growth through property operations, development and acquisitions, achieving market balance, and recycling capital are crucial factors to our success. We rely heavily on our sophisticated property management capabilities and innovative operating strategies to help us maximize the earnings potential of our communities.

Real Estate Investments and Market Balance. We believe we are well positioned in our current markets and have the expertise to take advantage of new opportunities as they arise. These capabilities, combined with what we believe is a conservative financial structure, should allow us to concentrate our growth efforts toward selective opportunities to enhance our strategy of having a geographically diverse portfolio of assets which meet the requirements of our residents.

We continue to operate in our core markets which we believe provides an advantage due to economies of scale. We believe, where possible, it is best to operate with a strong base of properties in order to benefit from the personnel allocation and the market strength associated with managing multiple properties in the same market. However, consistent with our goal of generating sustained earnings growth, we intend to selectively dispose of properties and redeploy capital for various strategic reasons, including if we determine a property cannot meet long-term earnings growth expectations.

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We try to maximize capital appreciation of our properties by investing in markets characterized by conditions favorable to multifamily property appreciation. These markets generally feature one or more of the following:

• Strong economic growth leading to household formation and job growth, which in turn leads to high demand for our apartments; and

• High barriers to entry where, because of land scarcity or government regulation, it is difficult or costly to build new apartment properties leading to low supply;

• High single family home prices making our apartments a more economical housing choice;

• An attractive quality of life leading to high demand and retention and allowing us to more readily increase rents.

Subject to market conditions, we intend to continue to look for opportunities to acquire existing communities, expand our development pipeline, and complete selective dispositions. We have two discretionary investment funds (the “Funds”), one of which is closed to future investment and the other of which will close to future investment at the earlier of April 2012 or at such time as 90% of its committed capital is invested, subject to certain exceptions.

We intend to continue to focus on strengthening our capital and liquidity positions by generating positive cash flows from operations, maintaining appropriate debt levels and leverage ratios, and controlling overhead costs. We intend to meet our liquidity requirements through available cash balances, the availability under our unsecured credit facility and other short-term borrowings, proceeds from dispositions of property and secured mortgage notes, equity issued from our 2011 at-the-market share offering program, and the use of debt and equity offerings under our automatic shelf registration statement.

Sophisticated Property Management. We believe the depth of our organization enables us to deliver quality services, promote resident satisfaction, and retain residents, thereby reducing operating expenses. We manage our properties utilizing a staff of professionals and support personnel, including certified property managers, experienced apartment managers and leasing agents, and trained apartment maintenance technicians. Our on-site personnel are trained to deliver high quality services to our residents. We strive to motivate our on-site employees through incentive compensation arrangements based upon property operational results, rental rate increases, occupancy levels, and level of lease renewals achieved.

Operations. We believe an intense focus on operations is necessary to realize consistent, sustained earnings growth. Ensuring resident satisfaction, increasing rents as market conditions allow, maximizing rent collections, maintaining property occupancy at optimal levels, and controlling operating costs comprise our principal strategies to maximize property financial results. We believe our web-based property management and revenue management systems strengthen on-site operations and allow us to quickly adjust rental rates as local market conditions change. Lease terms are generally staggered based on vacancy exposure by apartment type so lease expirations are matched to each property's seasonal rental patterns. We generally offer leases ranging from six to fifteen months with individual property marketing plans structured to respond to local market conditions. In addition, we conduct ongoing customer service surveys to ensure timely response to residents' changing needs and a high level of satisfaction.

Investments in Joint Ventures. We have entered into, and may continue in the future to enter into, joint ventures through which we own an indirect economic interest of less than 100% of the community or land owned directly by the joint venture. See Note 8, “Investments in Joint Ventures,” and Note 14, “Commitments and Contingencies,” in the Notes to Consolidated Financial Statements for further discussion of our investments in joint ventures.

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Competition

There are numerous housing alternatives which compete with our communities in attracting residents. Our properties compete directly with other multifamily properties as well as with condominiums and single-family homes which are available for rent or purchase in the markets in which our communities are located. This competitive environment could have a material adverse effect on our ability to lease apartment homes at our present communities or any newly developed or acquired community, as well as at the rents charged.

Employees

At December 31, 2011, we had approximately 1,885 employees, including executive, administrative, and community personnel. Our employee headcount does not vary significantly throughout the year.

Qualification as a Real Estate Investment Trust

As of December 31, 2011, we met the qualification of a REIT under Sections 856-860 of the Internal Revenue Code of 1986, as amended (the “Code”). As a result, we, with the exception of our taxable REIT subsidiaries, will not be subject to federal income tax to the extent we continue to meet certain requirements of the Code.

Item 1A. Risk Factors

In addition to the other information contained in this Form 10-K, the following risk factors should be considered carefully in evaluating our business. Our business, financial condition, or results of operations could be materially adversely affected by any of these risks. Additional risks not presently known to us, or which we currently consider immaterial, may also impair our business and operations.

Risks Associated with Real Estate, Real Estate Capital, and Credit Markets

Volatility in capital and credit markets, or other unfavorable changes in economic conditions, could adversely impact us.

The capital and credit markets are subject to volatility and disruption, as particularly experienced in the latter half of 2008 through most of 2010, during which spreads on prospective debt financings fluctuated and made it more difficult to borrow money. In the event of renewed market disruption and volatility, we may not be able to obtain new debt financing or refinance our existing debt on favorable terms or at all, which would adversely affect our liquidity, our ability to make distributions to shareholders, acquire and dispose of assets and continue our development pipeline. Other weakened economic conditions, including job losses and high unemployment rates, could adversely affect rental rates and occupancy levels. Unfavorable changes in economic conditions may have a material adverse impact on our cash flows and operating results.

Additional key economic risks which may adversely affect conditions in the markets in which we operate include the following:

• local conditions, such as an oversupply of apartments or other housing available for rent, or a reduction in demand for apartments in the area;

• declines in the financial condition of our tenants, which may make it more difficult for us to collect rents from some tenants;

• declines in market rental rates;

• low mortgage interest rates and home pricing, making alternative housing more affordable;

• government or builder incentives which enable home buyers to put little or no money down, making alternative housing options more attractive;

• regional economic downturns which affect one or more of our geographical markets; and

• increased operating costs, if these costs cannot be passed through to residents.

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Short-term leases expose us to the effects of declining market rents.

Substantially all of our apartment leases are for a term of fifteen months or less. As these leases generally permit the residents to leave at the end of the lease term without penalty, our rental revenues are impacted by declines in market rents more quickly than if our leases were for longer terms.

We face risks associated with land holdings and related activities.

We hold land for future development and may in the future acquire additional land holdings. The risks inherent in purchasing, owning, and developing land increase as demand for apartments, or rental rates, decrease. Real estate markets are highly uncertain and, as a result, the value of undeveloped land has fluctuated significantly and may continue to fluctuate. In addition, carrying costs can be significant and can result in losses or reduced profitability. As a result, we hold certain land, and may in the future acquire additional land, in our development pipeline at a cost we may not be able to fully recover or at a cost which precludes our developing a profitable multifamily community. If there are subsequent changes in the fair value of our land holdings which we determine is less than the carrying basis of our land holdings reflected in our financial statements plus estimated costs to sell, we may be required to take future impairment charges which would reduce our net income.

Difficulties of selling real estate could limit our flexibility.

We intend to continue to evaluate the potential disposition of assets which may no longer meet our investment objectives. When we decide to sell an asset, we may encounter difficulty in finding buyers in a timely manner as real estate investments generally cannot be disposed of quickly, especially when market conditions are poor. These factors may limit our ability to vary our portfolio promptly in response to changes in economic or other conditions and may also limit our ability to utilize sales proceeds as a source of liquidity, which would adversely affect our ability to make distributions to shareholders or repay debt. In addition, the provisions of the Code relating to REITs limit our ability to earn a gain on the sale of property (unless we own the property through a subsidiary which will incur a taxable gain upon sale) if we have held the property less than two years, and this limitation may affect our ability to sell properties without adversely affecting returns to shareholders.

We could be negatively impacted by the condition of Fannie Mae or Freddie Mac.

Fannie Mae and Freddie Mac are a major source of financing for secured multifamily real estate. We and other multifamily companies depend heavily on Fannie Mae and Freddie Mac to finance growth by purchasing or guaranteeing apartment loans. There have been discussions of reducing or eliminating Fannie Mae and Freddie Mac and a final decision by the government to eliminate Fannie Mae or Freddie Mac, or reduce their acquisitions or guarantees of apartment loans, may adversely affect interest rates, capital availability, and the development of multifamily communities.

Compliance or failure to comply with laws, including those requiring access to our properties by disabled persons, could result in substantial cost.

The Americans with Disabilities Act (“ADA”), the Fair Housing Amendments Act of 1988 (“FHAA”), and other federal, state, and local laws, rules, and regulations, generally require public accommodations and apartment homes be made accessible to disabled persons. Noncompliance could result in the imposition of fines by the government or the award of damages to private litigants. These laws may require us to modify our existing properties. These laws may also restrict renovations by requiring improved access to such buildings by disabled persons or may require us to add other structural features which increase our construction costs. Legislation or regulations adopted in the future may impose further costs and obligations or restrictions on us with respect to improved access by disabled persons. We may incur unanticipated expenses which may be material to our financial condition or results of operations to comply with ADA, FHAA, and other federal, state, and local laws, or in connection with lawsuits brought by the government or private litigants.

Competition could limit our ability to lease apartments or increase or maintain rental income.

There are numerous housing alternatives which compete with our properties in attracting residents. Our properties compete directly with other multifamily properties as well as condominiums and single family homes which are available for rent or purchase in the markets in which our properties are located. This competitive environment could have a material adverse effect on our ability to lease apartment homes at our present properties or any newly developed or acquired property, as well as on the rents realized.

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Risks Associated with Our Operations

Development and construction risks could impact our profitability.

We intend to continue to develop and construct multifamily apartment communities for our portfolio, and expect increased levels of development activity in 2012. Our development and construction activities may be exposed to a number of risks which may increase our construction costs and decrease our profitability, including the following:

• inability to obtain, or delays in obtaining, necessary zoning, land-use, building, occupancy, and other required permits and authorizations;

• increased materials and/or labor costs, problems with subcontractors, or other costs due to errors and omissions which occur in the design or construction process;

• inability to obtain financing with favorable terms for the development of a community;

• inability to complete construction and lease-up of a community on schedule;

• the expected occupancy and rental rates may differ from the actual results; and

• incurring costs related to the abandonment of development opportunities which we have pursued and subsequently deemed unfeasible.

Our inability to successfully implement our development and construction strategy could adversely affect our results of operations and our ability to satisfy our financial obligations and pay distributions to shareholders.

One of our wholly-owned subsidiaries is engaged in the business of providing general contracting services under construction contracts entered into between it and third-parties (including nonconsolidated subsidiaries). The terms of those construction contracts generally require this subsidiary to estimate the time and costs to complete a project, and to assume the risk the time and costs associated with its performance may be greater than anticipated. As a result, profitability on those contracts is dependent on the ability to accurately predict such factors. The time and costs necessary to complete a project may be affected by a variety of factors, including those listed above, many of which are beyond this subsidiary’s control. In addition, the terms of those contracts generally require this subsidiary to warrant its work for a period of time during which it may be required to repair, replace, or rebuild non-conforming work. Further, trailing liabilities, based on various legal theories such as claims of negligent construction, may result from such projects, and these trailing liabilities may go on for a number of years depending on the length of the statutes of repose in various jurisdictions.

Our acquisition strategy may not produce the cash flows expected.

We may acquire additional operating properties on a selective basis. Our acquisition activities are subject to a number of risks, including the following:

• we may not be able to successfully integrate acquired properties into our existing operations;

• our estimates of the costs, if any, of repositioning or redeveloping the acquired property may prove inaccurate;

• the expected occupancy and rental rates may differ from the actual results; and

• we may not be able to obtain adequate financing.

With respect to acquisitions of operating properties, we may not be able to identify suitable candidates on terms acceptable to us and may not achieve expected returns or other benefits as a result of integration challenges, such as personnel and technology.

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Competition could adversely affect our ability to acquire properties.

We expect other real estate investors, including insurance companies, pension and investment funds, private investors, and other multifamily REITs, will compete with us to acquire additional operating properties. This competition could increase prices for the type of properties we would likely pursue and adversely affect our ability to acquire these properties or the profitability of such properties upon acquisition.

Losses from catastrophes may exceed our insurance coverage.

We carry comprehensive property and liability insurance on our properties, which we believe is of the type and amount customarily obtained on similar real property assets by similar types of owners. We intend to obtain similar coverage for properties we acquire or develop in the future. However, some losses, generally of a catastrophic nature, such as losses from floods, hurricanes, or earthquakes, may be subject to coverage limitations. We exercise our discretion in determining amounts, coverage limits, and deductible provisions of insurance to maintain appropriate insurance on our investments at a reasonable cost and on suitable terms. If we suffer a catastrophic loss, our insurance coverage may not be sufficient to pay the full current market value or current replacement value of our lost investment, as well as the anticipated future revenues from the property. Inflation, changes in building codes and ordinances, environmental considerations, and other factors also may reduce the feasibility of using insurance proceeds to replace a property after it has been damaged or destroyed.

Investments through joint ventures involve risks not present in investments in which we are the sole investor.

We have invested and may continue to invest as a joint venture partner in joint ventures. These investments involve risks, including the possibility the other joint venture partner may have business goals which are inconsistent with ours, possess the ability to take action or withhold consent contrary to our requests, or become insolvent and require us to assume and fulfill the joint venture’s financial obligations. We and our joint venture partner may each have the right to initiate a buy-sell arrangement, which could cause us to sell our interest, or acquire our joint venture partner’s interest, at a time when we otherwise would not have entered into such a transaction. Each joint venture agreement is individually negotiated, and our ability to operate, finance, and/or dispose of a community in our sole discretion may be limited to varying degrees depending on the terms of the joint venture agreement.

We face risks associated with investments in and management of discretionary funds.

We have formed the Funds which, through wholly-owned subsidiaries, we manage as the general partner and advisor. Each of the Funds has total capital commitments of $187.5 million or $375 million in the aggregate. We have committed to invest 20% of the total equity interest in each of the Funds, up to $75 million in the aggregate. As of December 31, 2011, one of the Funds was closed for future investments. We have contributed approximately $33.0 million to this Fund and it had a combined equity capital investment of $165.0 million at December 31, 2011. As of December 31, 2011, our capital contribution to the remaining open Fund was approximately $23.7 million and it had a combined equity capital investment of approximately $118.4 million. There are risks associated with the investment in and management of the Funds, including:

• investors in the remaining open Fund may fail to make their capital contributions when due and, as a result, the Fund may be unable to execute its investment objectives;

• the general partner of the Funds, our wholly-owned subsidiary, has unlimited liability for the third-party debts, obligations, and liabilities of the Funds pursuant to partnership law;

• investors in the Funds (other than us), by majority vote, may remove our subsidiary as the general partner of the Funds with or without cause and the Funds’ advisory boards, by a majority vote of their members, may remove our subsidiary as the general partner of the Funds at any time for cause;

• while we have broad discretion to manage the Funds and make investment decisions on behalf of the Funds, the investors or the advisory boards must approve certain matters, and as a result we may be unable to cause the Funds to make certain investments or implement certain decisions we consider beneficial;

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• we are permitted to acquire land and develop communities outside of the remaining open Fund, but are generally prohibited from acquiring fully developed multifamily properties outside of this Fund until the earlier of (i) April 8, 2012, or (ii) such time as 90% of the remaining open Fund’s committed capital is invested, subject to certain exceptions;

• our ability to dispose of all or a portion of our investments in the Funds is subject to significant restrictions; and

• we may be liable if the Funds fail to comply with various tax or other regulatory matters.

Tax matters, including failure to qualify as a REIT, could have adverse consequences.

We may not continue to qualify as a REIT in the future. The Internal Revenue Service may challenge our qualification as a REIT for prior years and new legislation, regulations, administrative interpretations, or court decisions may change the tax laws or the application of the tax laws with respect to qualification as a REIT or the federal tax consequences of such qualification.

For any taxable year we fail to qualify as a REIT and do not qualify under statutory relief provisions:

• we would be subject to federal income tax on our taxable income at regular corporate rates, including any applicable alternative minimum tax;

• we would be disqualified from treatment as a REIT for the four taxable years following the year in which we failed to qualify, thereby reducing our net income, including any distributions to shareholders, as we would be required to pay significant income taxes for the year or years involved; and

• our ability to expand our business and raise capital would be impaired, which may adversely affect the value of our common shares.

We may face other tax liabilities in the future which may impact our cash flow. These potential tax liabilities may be calculated on our income or property values at either the corporate or individual property levels. Any additional tax expense incurred would decrease the cash available for cash distributions to our common shareholders, perpetual preferred unit holders, and noncontrolling interest holders.

We depend on our key personnel.

Our success depends in part on our ability to attract and retain the services of executive officers and other personnel. There is substantial competition for qualified personnel in the real estate industry, and the loss of several of our key personnel could have an adverse effect on us.

Changes in litigation risks could affect our business.

As a large publicly-traded owner of multifamily properties, we may become involved in legal proceedings, including consumer, employment, tort, or commercial litigation, which if decided adversely to or settled by us, could result in liability which is material to our financial condition or results of operations.

Risks Associated with Our Indebtedness and Financing

Insufficient cash flows could limit our ability to make required payments for debt obligations or pay distributions to shareholders.

Substantially all of our income is derived from rental and other income from our multifamily communities. As a result, our performance depends in large part on our ability to collect rent from residents, which could be negatively affected by a number of factors, including the following:

• delay in resident lease commencements;

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• decline in occupancy;

• failure of residents to make rental payments when due;

• the attractiveness of our properties to residents and potential residents;

• our ability to adequately manage and maintain our communities;

• competition from other available apartments and housing alternatives; and

• changes in market rents.

Cash flow could be insufficient to meet required payments of principal and interest with respect to debt financing. In order for us to continue to qualify as a REIT we must meet a number of organizational and operational requirements, including a requirement to distribute annual dividends to our shareholders equal to a minimum of 90% of our REIT taxable income, computed without regard to the dividends paid deduction and our net capital gains. This requirement limits the cash available to meet required principal payments on our debt.

We have significant debt, which could have important adverse consequences.

As of December 31, 2011, we had outstanding debt of approximately $2.4 billion. This indebtedness could have important consequences, including:

• if a property is mortgaged to secure payment of indebtedness, and if we are unable to meet our mortgage obligations, we could sustain a loss as a result of foreclosure on the mortgaged property;

• our vulnerability to general adverse economic and industry conditions is increased; and

• our flexibility in planning for, or reacting to, changes in business and industry conditions is limited.

The mortgages on our properties subject to secured debt, our unsecured credit facility, and the indentures under which our unsecured debt was issued contain customary restrictions, requirements, and other limitations, as well as certain financial and operating covenants including maintenance of certain financial ratios. Maintaining compliance with these provisions could limit our financial flexibility. A default in these provisions, if uncured, could require us to repay the indebtedness before the scheduled maturity date, which could adversely affect our liquidity and increase our financing costs.

We may be unable to renew, repay, or refinance our outstanding debt.

We are subject to the risk that indebtedness on our properties or our unsecured indebtedness will not be renewed, repaid, or refinanced when due or the terms of any renewal or refinancing will not be as favorable as the existing terms of such indebtedness. If we are unable to refinance our indebtedness on acceptable terms, or at all, we might be forced to dispose of one or more of the properties on disadvantageous terms, which might result in losses to us. Such losses could have a material adverse effect on us and our ability to make distributions to our shareholders and pay amounts due on our debt. Furthermore, if a property is mortgaged to secure payment of indebtedness and we are unable to meet mortgage payments, the mortgagee could foreclose on the property, appoint a receiver and exercise rights under an assignment of rents and leases, or pursue other remedies, all with a consequent loss of our revenues and asset value. Foreclosures could also create taxable income without accompanying cash proceeds, thereby hindering our ability to meet the REIT distribution requirements of the Code.

Variable rate debt is subject to interest rate risk.

We have mortgage debt with varying interest rates dependent upon various market indexes. In addition, we have a revolving credit facility bearing interest at a variable rate on all amounts drawn on the facility. We may incur additional variable rate debt in the future. Increases in interest rates on variable rate debt would increase our interest expense, unless we make arrangements which hedge the risk of rising interest rates, which would adversely affect net income and cash available for payment of our debt obligations and distributions to shareholders.

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We may incur losses on interest rate hedging arrangements.

Historically, we have entered into agreements to reduce the risks associated with changes in interest rates, and we may continue to do so in the future. Although these agreements may partially protect against rising interest rates, they may also reduce the benefits to us if interest rates decline. If a hedging arrangement is not indexed to the same rate as the indebtedness which is hedged, we may be exposed to losses to the extent which the rate governing the indebtedness and the rate governing the hedging arrangement change independently of each other. Additionally, nonperformance by the other party to the hedging arrangement may subject us to increased credit risks.

Issuances of additional debt may adversely impact our financial condition.

Our capital requirements depend on numerous factors, including the rental and occupancy rates of our multifamily properties, dividend payment rates to our shareholders, development and capital expenditures, costs of operations, and potential acquisitions. If our capital requirements vary materially from our plans, we may require additional financing earlier than anticipated. If we issue more debt, we could become more leveraged, resulting in increased risk of default on our obligations and an increase in our debt service requirements, both of which could adversely affect our financial condition and ability to access debt and equity capital markets in the future.

Failure to maintain our current credit ratings could adversely affect our cost of funds, related margins, liquidity, and access to capital markets.

Moody’s and Standard & Poor’s, the major debt rating agencies, routinely evaluate our debt and have given us ratings of Baa1 and BBB, respectively, with stable outlooks, on our senior unsecured debt. These ratings are based on a number of factors, which include their assessment of our financial strength, liquidity, capital structure, asset quality, and sustainability of cash flow and earnings. Due to changes in market conditions, we may not be able to maintain our current credit ratings, which could adversely affect our cost of funds and related margins, liquidity, and access to capital markets.

Risks Associated with Our Shares

Share ownership limits and our ability to issue additional equity securities may prevent takeovers beneficial to shareholders.

For us to maintain our qualification as a REIT, we must have 100 or more shareholders during the year and not more than 50% in value of our outstanding shares may be owned, directly or indirectly, by five or fewer individuals. As defined for federal income tax purposes, the term “individuals” includes a number of specified entities. To minimize the possibility of us failing to qualify as a REIT under this test, our declaration of trust includes restrictions on transfers of our shares and ownership limits. The ownership limits, as well as our ability to issue other classes of equity securities, may delay, defer, or prevent a change in control. These provisions may also deter tender offers for our common shares which may be attractive to you or limit your opportunity to receive a premium for your shares which might otherwise exist if a third party were attempting to effect a change in control transaction.

Our share price will fluctuate.

The market price and trading volume of our common shares are subject to fluctuation due to general market conditions, the risks discussed in this report and other matters, including the following:

• operating results which vary from the expectations of securities analysts and investors;

• investor interest in our property portfolio;

• the reputation and performance of REITs;

• the attractiveness of REITs as compared to other investment vehicles;

• the results of our financial condition and operations;

9

• the perception of our growth and earnings potential;

• dividend payment rates;

• increases in market interest rates, which may lead purchasers of our common shares to demand a higher yield; and

• changes in financial markets and national economic and general market conditions.

The form, timing and/or amount of dividend distributions in future periods may vary and be impacted by economic and other considerations.

The form, timing and/or amount of dividend distributions will be declared at the discretion of our Board of Trust Managers and will depend on actual cash from operations, our financial condition, capital requirements, the annual distribution requirements under the REIT provisions of the Code and other factors as the Board of Trust Managers may consider relevant. The Board of Trust Managers may modify the form, timing and/or amount of dividends from time to time.

Item 1B. Unresolved Staff Comments

None.

Item 2. Properties

The Properties

Our properties typically consist of mid-rise buildings or two and three story buildings in a landscaped setting and provide residents with a variety of amenities. Most of the properties have one or more swimming pools and a clubhouse and many have whirlpool spas, weight room facilities, and controlled-access gates. Many of the apartment homes offer additional amenities common to multifamily rental properties.

Operating Properties (including properties held through unconsolidated joint ventures)

The 196 operating properties in which we owned interests and operated at December 31, 2011 averaged 928 square feet of living area per apartment home. For the year ended December 31, 2011, no single operating property accounted for greater than 1.5% of our total revenues. Our operating properties had a weighted average occupancy rate of approximately 94.5% and 93.3% for the years ended December 31, 2011 and 2010, respectively, and an average annual rental revenue per apartment home of $970 and $928 for the years ended December 31, 2011 and 2010, respectively. Resident lease terms generally range from six to fifteen months. One hundred and seventy-one of our operating properties have over 200 apartment homes, with the largest having 904 apartment homes. Our operating properties have an average age of 12 years (calculated on the basis of investment dollars). Our operating properties were constructed and placed in service as follows:

	September 30,
Year Placed in Service	Number of Operating Properties
2006-2011	36
2001-2005	32
1996-2000	57
1991-1995	19
1986-1990	34
Prior to 1986	18

10

Property Table

The following table sets forth information with respect to our 196 operating properties at December 31, 2011:

		September 30,		September 30,		September 30,		September 30,			September 30,
	OPERATING PROPERTIES
Property and Location	Year Placed In Service		Average Apartment Size (Sq. Ft.)		Number of Apartments		2011 Average Occupancy  (1)			2011 Average Monthly Rental Rate per Apartment
ARIZONA
Phoenix
Camden Copper Square		2000		786		332		92.8	%	$	803
Camden Fountain Palms (2)		1986/1996		1,050		192		90.4			672
Camden Legacy		1996		1,067		428		94.3			887
Camden Pecos Ranch (2)		2001		924		272		94.1			796
Camden San Paloma		1993/1994		1,042		324		94.0			927
Camden Sierra (2)		1997		925		288		90.2			663
Camden Towne Center (2)		1998		871		240		91.2			669
Camden Vista Valley (3)		1986		923		357		91.4			626
CALIFORNIA
Los Angeles/Orange County
Camden Crown Valley		2001		1,009		380		94.5			1,532
Camden Harbor View		2004		975		538		94.7			1,904
Camden Main & Jamboree (4)		2008		1,011		290		95.8			1,756
Camden Martinique		1986		794		714		94.7			1,276
Camden Parkside (2)		1972		836		421		94.1			1,186
Camden Sea Palms		1990		891		138		96.6			1,452
San Diego/Inland Empire
Camden Old Creek		2007		1,037		350		93.2			1,564
Camden Sierra at Otay Ranch		2003		962		422		93.2			1,494
Camden Tuscany		2003		896		160		94.2			1,900
Camden Vineyards		2002		1,053		264		92.3			1,222
COLORADO
Denver
Camden Caley		2000		925		218		95.0			923
Camden Centennial		1985		744		276		93.2			701
Camden Denver West (5)		1997		1,015		320		94.1			1,083
Camden Highlands Ridge		1996		1,149		342		93.7			1,146
Camden Interlocken		1999		1,022		340		94.3			1,145
Camden Lakeway		1997		932		451		93.7			910
Camden Pinnacle		1985		748		224		93.6			725
WASHINGTON DC METRO
Camden Ashburn Farms		2000		1,062		162		97.1			1,412
Camden Clearbrook		2007		1,048		297		96.6			1,296
Camden College Park (4)		2008		942		508		94.3			1,556
Camden Dulles Station		2009		984		366		96.0			1,550
Camden Fair Lakes		1999		1,056		530		96.3			1,571
Camden Fairfax		2006		934		488		95.6			1,603
Camden Fallsgrove		2004		996		268		96.1			1,613
Camden Grand Parc		2002		674		105		95.2			2,430
Camden Lansdowne		2002		1,006		690		96.2			1,349
Camden Largo Town Center		2000/2007		1,027		245		93.8			1,586
Camden Monument Place		2007		856		368		95.7			1,464
Camden Potomac Yard		2008		835		378		94.8			1,912
Camden Roosevelt		2003		856		198		97.7			2,331
Camden Russett		2000		992		426		93.3			1,386
Camden Silo Creek		2004		975		284		96.5			1,362
Camden Summerfield		2008		957		291		93.7			1,546
FLORIDA
Southeast Florida
Camden Aventura		1995		1,108		379		93.5			1,432
Camden Brickell		2003		937		405		96.2			1,500
Camden Doral		1999		1,120		260		94.7			1,501
Camden Doral Villas		2000		1,253		232		94.3			1,615
Camden Las Olas		2004		1,043		420		95.1			1,606
Camden Plantation		1997		1,201		502		94.6			1,277

11

		September 30,		September 30,		September 30,		September 30,			September 30,
	OPERATING PROPERTIES
Property and Location	Year Placed In Service		Average Apartment Size (Sq. Ft.)		Number of Apartments		2011 Average Occupancy  (1)			2011 Average Monthly Rental Rate per Apartment
Camden Portofino		1995		1,112		322		94.4	%	$	1,310
Orlando
Camden Club		1986		1,077		436		95.1			837
Camden Hunter’s Creek		2000		1,075		270		95.6			952
Camden Lago Vista		2005		955		366		94.8			863
Camden Landings		1983		748		220		95.0			654
Camden Lee Vista		2000		937		492		95.5			831
Camden Orange Court		2008		817		268		94.8			1,056
Camden Renaissance		1996/1998		899		578		93.9			789
Camden Reserve		1990/1991		824		526		94.2			700
Camden World Gateway		2000		979		408		94.9			927
Tampa/St. Petersburg
Camden Bay		1997/2001		943		760		94.8			841
Camden Bay Pointe		1984		771		368		94.5			677
Camden Bayside		1987/1989		748		832		95.5			737
Camden Citrus Park		1985		704		247		94.8			654
Camden Lakes		1982/1983		732		688		93.5			663
Camden Lakeside		1986		729		228		93.5			719
Camden Live Oaks		1990		1,093		770		94.0			768
Camden Preserve		1996		942		276		94.6			999
Camden Providence Lakes		1996		1,024		260		93.1			886
Camden Royal Palms		2006		1,017		352		93.2			830
Camden Visconti (6) (7)		2007		1,125		450		96.2			1,080
Camden Westshore		1986		728		278		95.3			807
Camden Woods		1986		1,223		444		95.4			817
GEORGIA
Atlanta
Camden Brookwood		2002		912		359		95.3			950
Camden Deerfield		2000		1,187		292		93.1			917
Camden Dunwoody		1997		1,007		324		96.7			860
Camden Ivy Hall (6) (8)		2010		1,181		110		94.0			1,639
Camden Midtown Atlanta		2001		935		296		93.1			953
Camden Peachtree City		2001		1,027		399		95.0			884
Camden Phipps (6) (7)		1996		1,018		234		94.1			1,123
Camden River		1997		1,103		352		94.9			862
Camden Shiloh		1999/2002		1,143		232		94.7			837
Camden St. Clair		1997		999		336		93.5			876
Camden Stockbridge		2003		1,009		304		93.2			742
Camden Sweetwater		2000		1,151		308		93.0			710
MISSOURI
Kansas City
Camden Passage (9)		1989/1997		834		596		92.2			663
St. Louis
Camden Cedar Lakes (9)		1986		852		420		92.3			641
Camden Cove West (9)		1990		828		276		96.2			835
Camden Cross Creek (9)		1973/1980		947		591		94.9			764
Camden Westchase (9)		1986		945		160		97.3			869
NEVADA
Las Vegas
Camden Bel Air		1988/1995		943		528		91.6			716
Camden Breeze		1989		846		320		93.0			721
Camden Canyon		1995		987		200		94.8			846
Camden Commons		1988		936		376		91.3			741
Camden Cove		1990		898		124		93.1			713
Camden Del Mar		1995		986		560		95.4			890
Camden Fairways		1989		896		320		95.8			868
Camden Hills		1991		439		184		88.7			499
Camden Legends		1994		792		113		93.6			818
Camden Palisades		1991		905		624		91.9			725
Camden Pines (2)		1997		982		315		92.0			795
Camden Pointe		1996		983		252		93.5			732

12

		September 30,		September 30,		September 30,		September 30,			September 30,
	OPERATING PROPERTIES
Property and Location	Year Placed In Service		Average Apartment Size (Sq. Ft.)		Number of Apartments		2011 Average Occupancy  (1)			2011 Average Monthly Rental Rate per Apartment
Camden Summit (2)		1995		1,187		234		94.0	%	$	1,088
Camden Tiara (2)		1996		1,043		400		93.3			847
Camden Vintage		1994		978		368		91.9			715
Oasis Bay (10)		1990		876		128		96.4			752
Oasis Crossings (10)		1996		983		72		93.5			749
Oasis Emerald (10)		1988		873		132		92.7			627
Oasis Gateway (10)		1997		1,146		360		91.6			782
Oasis Island (10)		1990		901		118		91.3			636
Oasis Landing (10)		1990		938		144		92.5			693
Oasis Meadows (10)		1996		1,031		383		91.1			734
Oasis Palms (10)		1989		880		208		91.7			674
Oasis Pearl (10)		1989		930		90		91.6			711
Oasis Place (10)		1992		440		240		87.6			499
Oasis Ridge (10)		1984		391		477		84.0			421
Oasis Sierra (10)		1998		923		208		93.8			786
Oasis Springs (10)		1988		838		304		90.8			590
Oasis Vinings (10)		1994		1,152		234		90.1			733
NORTH CAROLINA
Charlotte
Camden Ballantyne		1998		1,045		400		95.8			866
Camden Cotton Mills		2002		905		180		97.9			1,079
Camden Dilworth		2006		857		145		97.0			1,099
Camden Fairview		1983		1,036		135		96.2			805
Camden Forest		1989		703		208		91.6			571
Camden Foxcroft (13)		1979		940		156		96.0			743
Camden Grandview		2000		1,057		266		97.2			1,205
Camden Habersham		1986		773		240		95.8			630
Camden Park Commons		1997		861		232		92.7			645
Camden Pinehurst		1967		1,147		407		95.5			747
Camden Sedgebrook		1999		972		368		96.0			796
Camden Simsbury		1985		874		100		96.3			745
Camden South End Square		2003		882		299		97.1			1,003
Camden Stonecrest		2001		1,098		306		95.0			906
Camden Touchstone		1986		899		132		96.8			729
Raleigh
Camden Crest		2001		1,013		438		94.5			773
Camden Governor’s Village		1999		1,046		242		93.4			879
Camden Lake Pine		1999		1,066		446		94.9			806
Camden Manor Park		2006		966		484		95.7			835
Camden Overlook		2001		1,060		320		95.2			887
Camden Reunion Park		2000/2004		972		420		93.0			701
Camden Westwood		1999		1,027		354		95.9			800
PENNSYLVANIA
Camden Valleybrook		2002		992		352		94.1			1,323
TEXAS
Austin
Camden Amber Oaks (6)		2009		862		348		94.4			809
Camden Brushy Creek (6) (7)		2008		882		272		96.9			800
Camden Cedar Hills		2008		911		208		94.5			975
Camden Gaines Ranch		1997		955		390		94.3			995
Camden Huntingdon		1995		903		398		95.0			754
Camden Laurel Ridge		1986		702		183		94.0			600
Camden Ridgecrest		1995		855		284		94.8			699
Camden Shadow Brook (6) (7)		2009		909		496		96.3			885
Camden South Congress (6)		2001		975		253		94.8			1,424
Camden Stoneleigh		2001		908		390		95.9			898
Corpus Christi
Camden Breakers		1996		868		288		96.2			930
Camden Copper Ridge		1986		775		344		94.4			694
Camden Miramar (11)		1994-2010		488		855		80.7			948
Camden South Bay (6)		2007		1,055		270		95.1			1,060

13

		September 30,		September 30,		September 30,		September 30,			September 30,
	OPERATING PROPERTIES
Property and Location	Year Placed In Service		Average Apartment Size (Sq. Ft.)		Number of Apartments		2011 Average Occupancy  (1)			2011 Average Monthly Rental Rate per Apartment
Dallas/Fort Worth
Camden Addison (2)		1996		942		456		96.1	%	$	790
Camden Buckingham		1997		919		464		95.8			804
Camden Centreport		1997		911		268		95.1			794
Camden Cimarron		1992		772		286		95.8			809
Camden Design District (6) (7)		2009		939		355		92.9			1,120
Camden Farmers Market		2001/2005		932		904		94.8			910
Camden Gardens		1983		652		256		96.4			548
Camden Glen Lakes		1979		877		424		95.4			755
Camden Legacy Creek		1995		831		240		96.4			855
Camden Legacy Park		1996		871		276		96.4			869
Camden Panther Creek (6) (7)		2009		946		295		94.9			952
Camden Riverwalk (6) (7)		2008		982		600		95.4			1,096
Camden Springs		1987		713		304		95.4			564
Camden Valley Park		1986		743		516		94.3			748
Camden Westview		1983		697		335		93.2			603
Houston
Camden Baytown		1999		844		272		91.0			786
Camden City Centre		2007		932		379		96.7			1,293
Camden Creek		1984		639		456		92.4			587
Camden Cypress Creek (6) (7)		2009		993		310		96.4			1,039
Camden Downs at Cinco Ranch (6) (7)		2004		1,075		318		96.3			1,006
Camden Grand Harbor (6) (7)		2008		959		300		96.9			984
Camden Greenway		1999		861		756		94.2			1,056
Camden Heights (6) (7)		2004		927		352		96.8			1,154
Camden Holly Springs (2)		1999		934		548		93.9			899
Camden Lakemont (6) (7)		2007		904		312		96.3			862
Camden Midtown		1999		844		337		96.0			1,252
Camden Northpointe (6) (7)		2008		940		384		95.4			922
Camden Oak Crest		2003		870		364		92.4			835
Camden Park (2)		1995		866		288		94.3			792
Camden Piney Point (6) (7)		2004		919		318		96.5			988
Camden Plaza (4)		2007		915		271		94.0			1,281
Camden Royal Oaks		2006		923		236		89.8			1,145
Camden Spring Creek (6) (7)		2004		1,080		304		92.1			981
Camden Steeplechase		1982		748		290		91.6			633
Camden Stonebridge		1993		845		204		94.7			806
Camden Sugar Grove (2)		1997		921		380		93.2			855
Camden Travis Street (12)		2010		819		253		96.1			1,289
Camden Vanderbilt		1996/1997		863		894		95.6			1,139
Camden Whispering Oaks		2008		934		274		95.0			989
Camden Woodson Park (6) (7)		2008		916		248		97.0			944
Camden Yorktown (6)		2008		995		306		94.0			915
San Antonio
Camden Braun Station (6) (7)		2006		827		240		95.2			828
Camden Westover Hills (6) (7)		2010		959		288		96.3			1,029

(1) Represents average physical occupancy for the year except as noted.

(2) Properties owned through a joint venture in which we own a 20% interest. The remaining interest is owned by an unaffiliated private investor. In January 2012, we acquired the remaining 80% ownership interest from this unaffiliated private investor.

(3) Property was included in properties held for sale at December 31, 2011. We sold this property in January 2012.

(4) Property owned through a fully-consolidated joint venture in which we own a 99.99% interest. The remaining interest is owned by an unaffiliated private investor.

(5) Property owned through a joint venture in which we own a 50% interest. The remaining interest is owned by an unaffiliated private investor.

(6) Properties owned through a joint venture in which we own a 20% interest. The remaining interest is owned by an unaffiliated pension fund.

14

(7) Property acquired during 2011—average occupancy calculated from date at which property was acquired, unless otherwise noted.

(8) Development property stabilized during 2011—average occupancy calculated from date at which occupancy exceeded 90% through year-end.

(9) Properties owned through a joint venture in which we own a 15% interest. The remaining interest is owned by an unaffiliated private investor.

(10) Properties owned through a joint venture in which we own a 20% interest. The remaining interest is owned by an unaffiliated pension fund.

(11) Miramar is a student housing project for Texas A&M at Corpus Christi. Average occupancy includes summer which is normally subject to high vacancies.

(12) Property owned through a fully-consolidated joint venture in which we own a 25% interest. The remaining interest is owned by an unaffiliated private investor.

(13) Property owned through a fully-consolidated joint venture in which we own a 75% interest. The remaining interest is owned by an unaffiliated private investor.

Item 3. Legal Proceedings

For discussion regarding legal proceedings, see Note 14, “Commitments and Contingencies,” in the Notes to Consolidated Financial Statements.

Item 4. Mine Safety Disclosures

None.

15

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

The high and low closing prices per share of our common shares, as reported on the New York Stock Exchange composite tape under the symbol “CPT,” and distributions per share declared for the quarters indicated are as follows:

		September 30,		September 30,		September 30,
	High		Low		Distributions
2011 Quarters:
First	$	59.17	$	53.47	$	0.49
Second		65.26		56.40		0.49
Third		69.32		55.26		0.49
Fourth		62.35		53.09		0.49
2010 Quarters:
First	$	43.94	$	36.77	$	0.45
Second		51.50		40.85		0.45
Third		49.90		39.15		0.45
Fourth		54.13		48.18		0.45

This graph assumes the investment of $100 on December 31, 2006 and quarterly reinvestment of dividends. (Source: SNL Financial LC)

		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,
	Years Ended December 31,
Index	2006		2007		2008		2009		2010		2011
Camden Property Trust		100.00		68.24		47.71		69.16		91.62		109.26
FTSE NAREIT Equity		100.00		84.31		52.50		67.20		85.98		93.11
S&P 500		100.00		105.49		66.46		84.05		96.71		98.76
Russell 2000		100.00		98.43		65.18		82.89		105.14		100.75
MSCI US REIT (RMS) Index		100.00		83.18		51.60		66.36		85.26		92.67

16

As of February 10, 2012, there were 553 shareholders of record and approximately 29,039 beneficial owners of our common shares.

In March 2010, we announced the creation of an at-the-market (“ATM”) share offering program through which we could, but had no obligation to, sell common shares having an aggregate offering price of up to $250 million (“2010 ATM program”), in amounts and at times as we determined, into the existing trading market at current market prices as well as through negotiated transactions. During the year ended December 31, 2010, we issued approximately 4.9 million common shares at an average price of $48.37 per share for total net consideration of approximately $231.7 million. During the year ended December 31, 2011, we issued approximately 0.3 million common shares at an average price of $55.81 per share for total net consideration of approximately $13.8 million. The 2010 ATM program was terminated and no further common shares are available for sale under the 2010 ATM program.

In May 2011, we created a second ATM share offering program through which we can sell common shares having an aggregate offering price of up to $300 million (“2011 ATM program”) from time to time into the existing trading market at current market prices as well as through negotiated transactions. We may, but have no obligation to, sell common shares through the 2011 ATM share offering program in amounts and at times as we determine. Actual sales from time to time may depend on a variety of factors, including, among others, market conditions, the trading price of our common shares, and determination of the appropriate sources of funding for us. During the year ended December 31, 2011, we issued approximately 1.5 million common shares at an average price of $62.98 per share for total net consideration of approximately $92.7 million. In January 2012, we issued approximately 0.1 million common shares at an average price of $62.41 per share for total net consideration of approximately $3.2 million. As of the date of this filing, we had common shares having an aggregate offering price of up to $202.4 million remaining available for sale under the 2011 ATM program.

In January 2012, we issued approximately 6.6 million common shares in a public equity offering and received approximately $391.6 million in net proceeds. We utilized these proceeds to fund the acquisition of the 80% interest not owned by us in twelve related joint ventures for approximately $99.5 million and the repayment of approximately $272.6 million in mortgage debt associated with these joint ventures.

See Part III, Item 12, for a description of securities authorized for issuance under equity compensation plans.

In January 2008, our Board of Trust Managers approved an increase of the April 2007 repurchase plan to allow for the repurchase of up to $500 million of our common equity securities through open market purchases, block purchases, and privately negotiated transactions. Under this program, we have repurchased 4.3 million shares for a total of approximately $230.2 million from April 2007 through December 31, 2011. The remaining dollar value of our common equity securities authorized to be repurchased under the program was approximately $269.8 million as of December 31, 2011. There were no repurchases of our equity securities during the years ended December 31, 2011, 2010 and 2009.

17

Item 6. Selected Financial Data

The following table provides selected financial data relating to our historical financial condition and results of operations as of and for each of the years ended December 31, 2007 through 2011. This data should be read in conjunction with Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the consolidated financial statements and related notes. Prior year amounts have been reclassified for discontinued operations.

COMPARATIVE SUMMARY OF SELECTED FINANCIAL AND PROPERTY DATA

		September 30,			September 30,			September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands, except per share amounts and property data)	2011			2010			2009			2008			2007
Operating Data (a)
Total property revenues	$	655,868		$	601,450		$	602,648		$	602,932		$	568,060
Total property expenses		256,679			242,912			237,599			230,275			209,042
Total non-property income (loss)		21,395			28,337			25,443			(19,540	)		25,002
Total other expenses		367,008			367,523			370,660			325,469			333,838
Income (loss) from continuing operations attributable to common shareholders		22,546			8,242			(75,201	)		(20,340	)		35,480
Net income (loss) attributable to common shareholders		49,379			23,216			(50,800	)		70,973			148,457
Income (loss) from continuing operations attributable to common shareholders per share:
Basic	$	0.30		$	0.11		$	(1.19	)	$	(0.37	)	$	0.60
Diluted		0.30			0.11			(1.19	)		(0.37	)		0.59
Net income (loss) attributable to common shareholders per share:
Basic	$	0.67		$	0.33		$	(0.80	)	$	1.28		$	2.54
Diluted		0.66			0.33			(0.80	)		1.28			2.50
Distributions declared per common share	$	1.96		$	1.80		$	2.05		$	2.80		$	2.76
Balance Sheet Data (at end of year)
Total real estate assets, at cost (e)	$	5,875,515		$	5,675,309		$	5,505,168		$	5,491,593		$	5,527,403
Total assets		4,622,075			4,699,737			4,607,999			4,730,342			4,890,760
Notes payable		2,432,112			2,563,754			2,625,199			2,832,396			2,828,095
Perpetual preferred units		97,925			97,925			97,925			97,925			97,925
Equity		1,827,768			1,757,373			1,609,013			1,501,356			1,653,340
Other Data
Cash flows provided by (used in):
Operating activities	$	244,834		$	224,036		$	217,688		$	216,958		$	223,106
Investing activities		(187,364	)		35,150			(69,516	)		(37,374	)		(346,798	)
Financing activities		(172,886	)		(152,767	)		(91,423	)		(173,074	)		123,555
Funds from operations – diluted (b)		207,535			194,309			109,947			169,585			227,153
Property Data
Number of operating properties (at the end of year)(c)		196			186			183			181			182
Number of operating apartment homes (at end of year) (c)		66,997			63,316			63,286			62,903			63,085
Number of operating apartment homes (weighted average) (c)(d)		50,905			50,794			50,608			51,277			53,132
Weighted average monthly total property revenue per apartment home	$	1,098		$	1,030		$	1,045		$	1,067		$	1,032
Properties under development (at end of period)		10			2			2			5			11

(a) Excludes discontinued operations.

(b) Management considers Funds from Operations (“FFO”) to be an appropriate measure of the financial performance of an equity REIT. The National Association of Real Estate Investment Trusts (“NAREIT”) currently defines FFO as net income (computed in accordance with accounting principles generally accepted in the United States of America (“GAAP”)), excluding gains (or losses) associated with the sale of previously depreciated operating properties, real estate depreciation and amortization, and adjustments for unconsolidated joint ventures. Our calculation of diluted FFO also assumes conversion of all potentially dilutive securities, including certain noncontrolling interests, which are convertible into common shares. We consider FFO to be an appropriate supplemental measure of operating performance because, by excluding gains or losses on dispositions of operating properties and excluding depreciation, FFO can assist in the comparison of the operating performance of a company’s real estate between periods or as compared to different companies.

(c) Includes discontinued operations.

(d) Excludes apartment homes owned in joint ventures.

(e) Includes properties held for sale.

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion should be read in conjunction with the consolidated financial statements and notes appearing elsewhere in this report. Historical results and trends which might appear in the consolidated financial statements should not be interpreted as being indicative of future operations.

We consider portions of this report to be “forward-looking” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, both as amended, with respect to our expectations for future periods. Forward-looking statements do not discuss historical fact, but instead include statements related to expectations, projections, intentions, or other items relating to the future; forward-looking statements are not guarantees of future performances, results, or events. Although we believe the expectations reflected in our forward-looking statements are based upon reasonable assumptions, we can give no assurance our expectations will be achieved. Any statements contained herein which are not statements of historical fact should be deemed forward-looking statements. Reliance should not be placed on these forward-looking statements as they are subject to known and unknown risks, uncertainties, and other factors beyond our control and could differ materially from our actual results and performance.

Factors that may cause our actual results or performance to differ materially from those contemplated by forward-looking statements include, but are not limited to, the following:

• volatility in capital and credit markets, or other unfavorable changes in economic conditions, could adversely impact us;

• short-term leases expose us to the effects of declining market rents;

• we face risks associated with land holdings and related activities;

• difficulties of selling real estate could limit our flexibility;

• we could be negatively impacted by the condition of Fannie Mae or Freddie Mac;

• compliance or failure to comply with laws, including those requiring access to our properties by disabled persons, could result in substantial cost;

• competition could limit our ability to lease apartments or increase or maintain rental income;

• development and construction risks could impact our profitability;

• our acquisition strategy may not produce the cash flows expected;

• competition could adversely affect our ability to acquire properties;

• losses from catastrophes may exceed our insurance coverage;

• investments through joint ventures involve risks not present in investments in which we are the sole investor;

• we face risks associated with investments in and management of discretionary funds;

• tax matters, including failure to qualify as a REIT, could have adverse consequences;

• we depend on our key personnel;

• changes in litigation risks could affect our business;

• insufficient cash flows could limit our ability to make required payments for debt obligations or pay distributions to shareholders;

• we have significant debt, which could have important adverse consequences;

• we may be unable to renew, repay, or refinance our outstanding debt;

• variable rate debt is subject to interest rate risk;

• we may incur losses on interest rate hedging arrangements;

• issuances of additional debt may adversely impact our financial condition;

• failure to maintain our current credit ratings could adversely affect our cost of funds, related margins, liquidity, and access to capital markets;

• share ownership limits and our ability to issue additional equity securities may prevent takeovers beneficial to shareholders;

• our share price will fluctuate; and

• the form, timing and/or amount of dividend distributions in future periods may vary and be impacted by economic or other considerations.

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These forward-looking statements represent our estimates and assumptions as of the date of this report, and we assume no obligation to update or supplement forward-looking statements because of subsequent events.

Executive Summary

We are primarily engaged in the ownership, management, development, acquisition and construction of multifamily apartment communities. As of December 31, 2011, we owned interests in, operated, or were developing 206 multifamily properties comprising 69,794 apartment homes across the United States as detailed in the following Property Portfolio table. In addition, we own other land parcels we may develop into multifamily apartment communities.

Property Operations

Our results for the year ended December 31, 2011 reflect an increase in rental revenue as compared to 2010, which we believe was primarily due to a gradually improving economy, favorable demographics, a modest supply of new multifamily housing, and a decrease in home ownership rates, which have resulted in increases in realized rental rates and average occupancy levels. Same store revenues increased 5.5% as compared to 2010. We believe economic and employment conditions will improve slightly during 2012 and the supply of new multifamily homes will continue to be modest. However, we believe significant risks to the economy remain prevalent, and while there has been a slight increase in employment levels in the majority of our markets, the unemployment rate remains at higher than historical levels. If economic conditions in the United States were to worsen, our operating results could be adversely affected.

Development Activity

During the year ended December 31, 2011, we began construction on eight development projects including two development projects in our discretionary funds, in which we own a 20% ownership interest (the “Funds”). These eight projects contain 2,190 units, with initial occupancy expected throughout 2012 and 2013. At December 31, 2011, we had a total of ten development projects under construction containing 2,797 units with initial occupancy expected between 2011 and 2013. Excluding the two Fund development projects containing 520 units, we have remaining anticipated construction expenditures of approximately $180.0 million on the eight consolidated projects under construction as of December 31, 2011.

Acquisitions and Dispositions

In August 2011, we acquired 30.1 acres of land located in Atlanta, Georgia for approximately $40.1 million. In December 2011, we acquired 2.2 acres of land in Glendale, California for approximately $21.4 million. We intend to utilize these land holdings for development of multiple multifamily apartment communities, subject to, among other matters, market conditions.

During the fourth quarter of 2011, we sold two properties consisting of 788 units located in Dallas, Texas for approximately $39.7 million and recognized a gain of approximately $24.6 million on the sale. During January 2012, we sold one property consisting of 357 units located in Phoenix, Arizona for approximately $24.5 million.

In April 2011, we sold one of our land parcels to one of the Funds for approximately $9.4 million and we were reimbursed for previously written-off third-party development costs, resulting in a gain of approximately $4.7 million. In June 2011, we sold another land parcel to this Fund for approximately $3.1 million, resulting in a gain of approximately $0.1 million. Development of 520 units on these two parcels commenced in 2011.

During the year ended December 31, 2011, the Funds acquired eighteen multifamily properties totaling 6,076 units located in the Houston, Dallas, Austin, San Antonio, Tampa, and Atlanta metropolitan areas. In January 2012, one of the Funds acquired one multifamily property comprised of 350 units located in Raleigh, North Carolina.

In January 2012, we issued approximately 6.6 million common shares in a public equity offering and received approximately $391.6 million in net proceeds. We utilized these proceeds to fund the acquisition of the 80% interest not owned by us in twelve related joint ventures for approximately $99.5 million and the repayment of approximately $272.6 million in mortgage debt associated with these joint ventures. In connection with this acquisition of the joint venture interests, we acquired twelve operating properties consisting of 4,034 units located in Dallas, Houston, Las Vegas, Phoenix and Southern California.

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During the fourth quarter of 2011, one of our unconsolidated joint ventures sold four operating properties consisting of 1,194 units located in Louisville, Kentucky. Our proportionate share of the gain was approximately $6.4 million.

In March 2011, we sold our ownership interests in three unconsolidated joint ventures for total proceeds of approximately $19.3 million and recognized a gain of approximately $1.1 million. Two of these joint ventures owned multifamily properties in Houston comprised of 459 units, and the remaining joint venture owned 6.1 acres of land in Houston.

Future Outlook

Subject to market conditions, we intend to continue to look for opportunities to expand our development pipeline, acquire existing communities, and complete selective dispositions. We also intend to continue to strengthen our capital and liquidity positions by continuing to focus on our core fundamentals, which are generating positive cash flows from operations, maintaining appropriate debt levels and leverage ratios, and controlling overhead costs. We intend to meet our liquidity requirements through available cash balances, cash flows generated from operations, draws on our unsecured credit facility, proceeds from property dispositions and secured mortgage notes, equity issued from our 2011 at-the-market share offering program, and the use of debt and equity offerings under our automatic shelf registration statement.

As of December 31, 2011, we had approximately $55.2 million in cash and cash equivalents and no balances outstanding on our $500 million unsecured line of credit; we recently extended the maturity date of our unsecured line of credit to September 2015, with options to extend the maturity to September 2016. Additionally, we now have the option to increase this credit facility to $750 million by either adding additional banks to the credit facility or obtaining the agreement of existing banks to increase their commitments. We believe payments on debt maturing in 2012 are manageable at $294.2 million, which represents approximately 12% of our total outstanding debt. Included in these maturities are four debt instruments of approximately $102.1 million which have automatic one year extensions which we may or may not exercise at our election. We also believe we are well-positioned with a strong balance sheet and sufficient liquidity to cover near-term debt maturities and new development funding requirements. We will, however, continue to assess and take further actions where we believe prudent to meet our objectives and capital requirements.

Property Portfolio

Our multifamily property portfolio is summarized as follows:

		September 30,		September 30,		September 30,		September 30,
	December 31, 2011				December 31, 2010
	Apartment				Apartment
	Homes		Properties		Homes		Properties
Operating Properties
Houston, Texas (1)		9,354		26		6,967		19
Las Vegas, Nevada		8,016		29		8,016		29
Dallas, Texas		5,979		15		5,517		14
Tampa, Florida		5,953		13		5,503		12
Washington, D.C. Metro		5,604		16		5,604		16
Charlotte, North Carolina		3,574		15		3,574		15
Orlando, Florida		3,564		9		3,557		9
Atlanta, Georgia		3,546		12		3,312		11
Austin, Texas		3,222		10		2,454		8
Raleigh, North Carolina		2,704		7		2,704		7
Southeast Florida		2,520		7		2,520		7
Los Angeles/Orange County, California		2,481		6		2,481		6
Phoenix, Arizona (2)		2,433		8		2,433		8
Denver, Colorado		2,171		7		2,171		7
San Diego/Inland Empire, California		1,196		4		1,196		4
Other		4,680		12		5,307		14
Total Operating Properties		66,997		196		63,316		186

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		September 30,		September 30,		September 30,		September 30,
	December 31, 2011				December 31, 2010
	Apartment				Apartment
	Homes		Properties		Homes		Properties
Properties Under Development
Orlando, Florida		858		2		420		1
Washington, D.C. Metro		783		3		187		1
Tampa, Florida		540		2		—		—
Houston, Texas		372		2		—		—
Austin, Texas		244		1		—		—
Total Properties Under Development		2,797		10		607		2
Total Properties		69,794		206		63,923		188
Less: Unconsolidated Joint Venture Properties (3)
Houston, Texas		4,368		13		1,981		6
Las Vegas, Nevada		4,047		17		4,047		17
Dallas, Texas		1,706		4		456		1
Austin, Texas		1,613		5		601		2
Phoenix, Arizona		992		4		992		4
Tampa, Florida		450		1		—		—
Los Angeles/Orange County, California		421		1		421		1
Denver, Colorado		320		1		320		1
Atlanta, Georgia		344		2		110		1
Washington, D. C. Metro		276		1		—		—
Other		2,841		8		3,507		10
Total Joint Venture Properties (4)		17,378		57		12,435		43
Total Properties Fully Consolidated		52,416		149		51,488		145

(1) Includes a fully consolidated joint venture Camden Travis Street, of which we retain a 25%ownership.

(2) Includes one property consisting of 357 apartment homes located in Phoenix, which was included in properties held for sale at December 31, 2011. This property was sold in January 2012.

(3) Refer to Note 8, “Investments in Joint Ventures,” in the Notes to Consolidated Financial Statements for further discussion of our unconsolidated joint venture investments.

(4) In January 2012, we acquired the remaining equity interests of twelve joint venture properties consisting of 4,034 apartments homes located in Dallas, Houston, Las Vegas, Phoenix and Southern California. Refer to Note 8, “Investments in Joint Ventures” in the Notes to Consolidated Financial Statements for further discussion of this transaction.

Stabilized Communities

We generally consider a property stabilized once it reaches 90% occupancy at the beginning of a period. During the year ended December 31, 2011, stabilization was achieved at one of our joint venture properties as follows:

		September 30,		September 30,		September 30,
Property and Location	Number of Apartment Homes		Date of Construction Completion		Date of Stabilization
Camden Ivy Hall – joint venture     Atlanta, GA		110		4Q10		3Q11

Acquisitions

In August 2011, we acquired 30.1 acres of land located in Atlanta, Georgia for approximately $40.1 million. In December 2011, we acquired 2.2 acres of land in Glendale, California for approximately $21.4 million. We intend to utilize these land holdings for development of multiple multifamily apartment communities, subject to, among other matters, market conditions.

During the year ended December 31, 2011, the Funds acquired eighteen multifamily properties comprised of 2,846 units located in Houston, Texas, 1,250 units located in Dallas, Texas, 768 units located in Austin, Texas, 450 units located in Tampa, Florida, 528 units located in San Antonio, Texas, and 234 units located in Atlanta, Georgia. In January 2012, one of the Funds acquired one multifamily property comprised of 350 units located in Raleigh, North Carolina.

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In January 2012, we purchased the remaining 80% ownership interest in twelve unconsolidated joint ventures for approximately $99.5 million and repaid approximately $272.6 million in mortgage debt associated with these joint ventures. In connection with this acquisition of the joint venture interests, we acquired twelve operating properties consisting of 4,034 units located in Dallas, Houston, Las Vegas, Phoenix and Southern California. We funded this acquisition and debt repayment with net proceeds raised through a public equity offering completed in January 2012.

Partial Sales, Dispositions to Joint Ventures and Dispositions by Joint Ventures

In April 2011, we sold one of our land parcels in Washington, D.C. to one of the Funds, in which we have a 20% interest, for approximately $9.4 million and we were reimbursed for previously written off third-party development costs, resulting in a gain of approximately $4.7 million. In June 2011, we sold one of our development properties in Austin, Texas, to this Fund for approximately $3.1 million, resulting in a gain of approximately $0.1 million.

During March 2011, we sold our ownership interests in three unconsolidated joint ventures for total proceeds of approximately $19.3 million and recognized a gain of approximately $1.1 million. Two of these joint ventures own multifamily properties in Houston, Texas with 459 units, and one joint venture owns 6.1 acres of land in Houston, Texas.

During the fourth quarter of 2011, one of our unconsolidated joint ventures sold four operating properties consisting of 1,194 units located in Louisville, Kentucky. Our proportionate share of the gain was approximately $6.4 million which is included as a component of equity in income (loss) of joint ventures.

There were no partial sales or dispositions to joint ventures for the years ended December 31, 2010 or 2009.

Discontinued Operations

We intend to maintain a long-term strategy of managing our invested capital through the selective sale of properties and to utilize the proceeds to reduce our outstanding debt and leverage ratios and fund investments with higher anticipated growth prospects in our markets. Income from discontinued operations includes the operations of properties sold during the year ended December 31, 2011. The components of earnings classified as discontinued operations include separately identifiable property-specific revenues, expenses, depreciation, and interest expense, if any. Any gain or loss on the disposal of the properties held for sale is also classified as discontinued operations.

A summary of our 2011 dispositions is as follows:

		September 30,		September 30,		September 30,
Property and Location	Number of Apartment Homes		Date of Disposition		Year Placed in Service
Camden Valley Creek     Dallas, TX		380		4Q11		1984
Camden Valley Ridge     Dallas, TX		408		4Q11		1987

During the fourth quarter of 2011, we received net proceeds of approximately $38.2 million and recognized a gain of approximately $24.6 million from the sale of the two wholly owned operating properties above, containing 788 apartment homes, to unaffiliated third parties. During the year ended December 31, 2010, we received net proceeds of approximately $101.9 million and recognized a gain of approximately $9.6 million from the sale of two operating properties containing 1,066 apartment homes to an unaffiliated third party. During the year ended December 31, 2009, we received net proceeds of approximately $28.0 million and recognized a gain of approximately $16.9 million from the sale of one operating property, containing 671 apartment homes, to an unaffiliated third party.

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During the year ended December 31, 2010, we recognized a gain of approximately $0.2 million from the sale of land in Houston, Texas. The gain on this sale was not included in discontinued operations as the operations and cash flows of this asset was not clearly distinguished, operationally or for reporting purposes, from the adjacent assets.

Development and Lease-Up Properties

At December 31, 2011, we had eight consolidated properties in various stages of construction as follows:

		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,
($ in millions) Property and Location	Number of Apartment Homes		Estimated Cost		Cost Incurred		Included in Properties Under Development		Estimated Date of Construction Completion		Estimated Date of Stabilization
Camden LaVina (1) Orlando, FL		420	$	60.0	$	54.8	$	6.4		2Q12		1Q13
Camden Summerfield II (1) Landover, MD		187		30.0		24.3		10.0		1Q12		4Q12
Camden Royal Oaks II (2) Houston, TX		104		14.0		11.1		11.1		2Q12		3Q13
Camden Montague Tampa, FL		192		23.0		13.4		13.4		3Q12		2Q13
Camden Town Square Orlando, FL		438		66.0		28.7		28.7		3Q13		4Q14
Camden Westchase Park Tampa, FL		348		52.0		29.6		29.6		1Q13		4Q13
Camden City Centre II Houston, TX		268		36.0		10.1		10.1		2Q13		3Q14
Camden NOMA Washington, D. C. Metro		320		110.0		39.0		39.0		2Q14		2Q15
Total		2,277	$	391.0	$	211.0	$	148.3

(1) Property in lease-up as of December 31, 2011.

(2) Property in lease-up as of January 2012.

Our consolidated balance sheet at December 31, 2011 included approximately $299.9 million related to properties under development and land. Of this amount, approximately $148.3 million related to our projects currently under development. In addition, we had approximately $151.6 million primarily invested in land held for future development, which included approximately $84.8 million related to projects we expect to begin constructing during the next two years, and approximately $66.8 million invested in land tracts for which we may develop in the future.

At December 31, 2011, we had investments in unconsolidated joint ventures which were developing the following multifamily communities:

		September 30,			September 30,		September 30,
($ in millions) Property and Location	Ownership %			Number of Apartment Homes		Total Cost Incurred
Under Construction:
Camden South Capitol Washington, DC		20	%		276	$	29.8
Camden Amber Oaks II Austin, TX		20	%		244		8.6
Total Under Construction					520	$	38.4

Refer to Note 8, “Investments in Joint Ventures” in the Notes to Consolidated Financial Statements for further discussion of our joint venture investments.

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Geographic Diversification

At December 31, 2011 and 2010, our investments in various geographic areas, excluding depreciation, investments in joint ventures and properties held for sale, were as follows:

		September 30,	September 30,			September 30,	September 30,
(in thousands)	2011				2010
Washington, D.C. Metro	$	1,234,401	21.2	%	$	1,214,165	21.5	%
Southeast Florida		462,384	8.0			456,127	8.1
Houston, Texas		452,830	7.8			432,697	7.7
Los Angeles/Orange County, California		452,451	7.8			426,527	7.5
Tampa, Florida		436,922	7.5			404,718	7.2
Orlando, Florida		422,811	7.3			381,642	6.8
Atlanta, Georgia		369,107	6.3			322,741	5.7
Dallas, Texas		302,299	5.2			329,222	5.8
Charlotte, North Carolina		331,518	5.7			321,838	5.7
Las Vegas, Nevada		315,330	5.4			311,186	5.5
Raleigh, North Carolina		243,114	4.2			239,840	4.2
San Diego/Inland Empire, California		228,582	3.9			227,784	4.0
Denver, Colorado		193,285	3.3			189,644	3.4
Austin, Texas		156,833	2.7			155,714	2.8
Phoenix, Arizona		98,698	1.7			119,826	2.1
Other		118,975	2.0			114,006	2.0
Total	$	5,819,540	100.0	%	$	5,647,677	100.0	%

Results of Operations

Changes in revenues and expenses related to our operating properties from period to period are due primarily to the performance of stabilized properties in the portfolio, the lease-up of newly constructed properties, acquisitions, and dispositions. Where appropriate, comparisons of income and expense on communities included in continuing operations are made on a dollars-per-weighted average apartment home basis in order to adjust for such changes in the number of apartment homes owned during each period. Selected weighted averages for the years ended December 31 are as follows:

		September 30,			September 30,			September 30,
	2011			2010			2009
Average monthly property revenue per apartment home	$	1,098		$	1,030		$	1,045
Annualized total property expenses per apartment home	$	5,155		$	4,992		$	4,944
Weighted average number of consolidated operating apartment homes		49,793			48,656			48,061
Weighted average occupancy of consolidated operating apartment homes*		94.6	%		93.7	%		94.8	%

* The student housing community is excluded from this calculation.

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Property-level operating results

The following tables present the property-level revenues and property-level expenses, excluding discontinued operations, for the year ended December 31, 2011 as compared to 2010 and for the year ended December 31, 2010 as compared to 2009:

		September 30,		September 30,		September 30,		September 30,			September 30,
	Apartment Homes		Year Ended December 31,				Change
($ in thousands)	at 12/31/11		2011		2010		$			%
Property revenues:
Same store communities		46,164	$	595,217	$	564,218	$	30,999			5.5	%
Non-same store communities		3,618		54,887		32,967		21,920			66.5
Development and lease-up communities		2,277		715		—		715			—
Other		—		5,049		4,265		784			18.4
Total property revenues		52,059	$	655,868	$	601,450	$	54,418			9.0	%
Property expenses:
Same store communities		46,164	$	231,925	$	225,072	$	6,853			3.0	%
Non-same store communities		3,618		20,571		12,922		7,649			59.2
Development and lease-up communities		2,277		222		—		222			—
Other		—		3,961		4,918		(957	)		(19.5	)
Total property expenses		52,059	$	256,679	$	242,912	$	13,767			5.7	%

Same store communities are communities we owned and which were stabilized as of January 1, 2010. Non-same store communities are stabilized communities we have acquired, developed, or re-developed after January 1, 2010. Development and lease-up communities are non-stabilized communities we have acquired or developed after January 1, 2010. Other includes results from non-multifamily rental properties and expenses primarily relating to land holdings not under active development.

		September 30,		September 30,		September 30,		September 30,			September 30,
	Apartment Homes		Year Ended December 31,				Change
($ in thousands)	at 12/31/10		2010		2009		$			%
Property revenues:
Same store communities		45,148	$	548,588	$	559,564	$	(10,976	)		(2.0	)%
Non-same store communities		4,588		48,596		38,265		10,331			27.0
Development and lease-up communities		607		—		—		—			—
Other		—		4,266		4,819		(553	)		(11.5	)
Total property revenues		50,343	$	601,450	$	602,648	$	(1,198	)		(0.2	)%
Property expenses:
Same store communities		45,148	$	218,940	$	218,217	$	723			0.3	%
Non-same store communities		4,588		18,987		15,954		3,033			19.0
Development and lease-up communities		607		—		—		—			—
Other		—		4,985		3,428		1,557			45.4
Total property expenses		50,343	$	242,912	$	237,599	$	5,313			2.2	%

Same store communities are communities we owned and which were stabilized as of January 1, 2009. Non-same store communities are stabilized communities we have acquired, developed, or re-developed after January 1, 2009. Development and lease-up communities are non-stabilized communities we have developed or acquired after January 1, 2009. Other includes results from non-multifamily rental properties and expenses primarily relating to land holdings not under active development.

Same store analysis:

Same store property revenues for the year ended December 31, 2011 increased approximately $31.0 million, or 5.5%, from 2010. Same store rental revenues increased approximately $25.3 million for the year ended December 31, 2011 as compared to 2010, primarily due to a 4.6% increase in average rental rates and a 0.7% increase in average occupancy for our same store portfolio. During the year ended December 31, 2011, average rental rates on new leases were 3.6% higher than expiring lease rates and average renewal rates were 7.9% higher than expiring lease rates. We believe the increases to rental revenue were due in part to the continued decline in home ownership rates and the limited supply of new rental housing. Additionally, there was a $5.7 million increase in other property revenue during the year ended December 31, 2011 as compared to 2010 primarily due to increases in revenues from our utility rebilling programs and miscellaneous fees and charges.

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Same store property revenues for the year ended December 31, 2010 decreased approximately $11.0 million, or 2.0%, from 2009. Same store rental revenues decreased approximately $11.4 million, or 2.4%, from 2009 primarily due to a 2.3% decline in average rental rates partially offset by a slight increase in average occupancy. The decline in average rental rates was due to the continuation of the recession through the first quarter of 2010, offset by improving rental rates and slight improvements in average occupancy levels for the last three quarters of 2010 which we believe is due in part to the continued decline in home ownership rates and the limited supply of new rental housing. The decrease was also partially offset by a $0.4 million increase in other property revenue primarily due to increases in revenue from our utility rebilling programs.

Property expenses from our same store communities increased approximately $6.9 million, or 3.0%, for the year ended December 31, 2011 as compared to 2010. The increase was primarily due to increases in utility expenses relating to costs associated with our utility rebilling programs mentioned above, and higher water costs, increased salaries and benefits due to increases in annual compensation and higher medical benefit costs, and higher repairs and maintenance expenses. The increase was also due to slightly higher real estate taxes as a result of increasing property valuations and property tax rates at a number of our communities. Excluding the expenses associated with our rebilling programs, same store property expenses for the year ended December 31, 2011 increased approximately $5.6 million, or 2.7%, as compared to 2010.

Property expenses from our same store communities increased approximately $0.7 million, or 0.3%, for the year ended December 31, 2010, as compared to 2009. The increase was primarily due to expenses related to our utility rebilling programs discussed above, higher salaries, and increases in property insurance and repair and maintenance costs. These increases were partially offset by lower real estate taxes as a result of declining rates and valuations at a number of our communities. Excluding the expenses associated with our utility rebilling programs, same store property expenses for 2010 decreased approximately $1.0 million, or 0.5%, from 2009.

Non-same store and development and lease-up analysis:

Property revenues from non-same store and development and lease-up communities increased approximately $22.6 million for the year ended December 31, 2011 as compared to 2010 and increased approximately $10.3 million for the year ended December 31, 2010 as compared to 2009. The increase in 2011 was primarily due to $18.0 million of revenues during 2011 relating to three joint venture communities we consolidated during the second half of 2010, which were previously accounted for in accordance with the equity method of accounting. The increase in revenues was also related to two properties in our development and re-development pipelines reaching stabilization during the second and third quarters of 2010. One of these properties is owned by a fully consolidated joint venture, of which we hold a 25% ownership interest. The increase in 2010 as compared to 2009 was primarily due to seven consolidated properties in our development and re-development pipelines reaching stabilization during 2009 and 2010, in addition to approximately $2.6 million of revenues recognized in the second half of 2010 related to the three joint venture communities we consolidated as discussed above.

Property expenses from non-same store and development and lease-up communities increased approximately $7.9 million for the year ended December 31, 2011 as compared to 2010 and increased approximately $3.0 million for 2010 as compared to 2009. The increase in 2011 was primarily due to $7.1 million of expenses during 2011 relating to three joint venture communities we consolidated during the second half of 2010. The increase in 2010 was due to a number of consolidated properties in our development and re-development pipelines reaching stabilization during 2009 and 2010. The increase in 2010 was also due to approximately $1.1 million of expenses recognized in the second half of 2010 related to the three joint venture communities we consolidated as discussed above.

Other property analysis:

Other property revenues increased approximately $0.8 million for the year ended December 31, 2011 as compared to 2010 and decreased $0.5 million for the year ended December 31, 2010 as compared to 2009. The increase in 2011 was primarily related to increases in rental income from our non-multifamily rental properties as compared to 2010. The decrease in 2010 as compared to 2009 was due to lower rental income from our non-multifamily rental properties.

Other property expenses decreased approximately $1.0 million for the year ended December 31, 2011 as compared to 2010 and increased $1.6 million for the year ended December 31, 2010 as compared to 2009. The decrease in 2011 was primarily related to decreases in property taxes expensed on land holdings for projects which were approved during 2011 and the second half of 2010 for development activities. As a result, we started

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capitalizing expenses, including property taxes, on these development projects. The increase in 2010 as compared to 2009 primarily related to increases in property taxes expensed on land holdings for eight projects for which we decided in 2009 to postpone development. As a result, we ceased capitalization of expenses, including property taxes.

Non-property income

		September 30,		September 30,		September 30,			September 30,			September 30,		September 30,		September 30,			September 30,
	Year Ended December 31,				Change						Year Ended December 31,				Change
($ in thousands)	2011		2010		$			%			2010		2009		$			%
Fee and asset management	$	9,973	$	8,172	$	1,801			22.0	%	$	8,172	$	8,008	$	164			2.0	%
Interest and other income		4,649		8,584		(3,935	)		(45.8	)		8,584		2,826		5,758			203.8
Income on deferred compensation plans		6,773		11,581		(4,808	)		(41.5	)		11,581		14,609		(3,028	)		(20.7	)
Total non-property income	$	21,395	$	28,337	$	(6,942	)		(24.5	)%	$	28,337	$	25,443	$	2,894			11.4	%

Fee and asset management income, increased approximately $1.8 million for the year ended December 31, 2011 as compared to 2010 and increased approximately $0.2 million for the year ended December 31, 2010 as compared to 2009. The increase for 2011 was primarily due to an increase in property management, development and construction fees due to acquisitions by our Funds during 2011 and the fourth quarter of 2010. The increase was partially offset by a decrease due to our consolidation of three joint venture communities during the second half of 2010, which were previously accounted for in accordance with the equity method of accounting. The increase was further offset by a decrease in construction fees due to a reduction in third-party construction activities during 2011 as compared to 2010.

The increase in fee and asset management income for 2010 as compared to 2009 was primarily related to an increase in third-party construction activities, offset by decreases in development and construction fees earned on our development joint ventures as compared to 2009 due to the completion of construction activities during 2009 and 2010. The increase was further offset by decreases in fees earned on our stabilized joint ventures due to declines in property revenues.

Interest and other income decreased approximately $3.9 million for 2011 as compared to 2010 and increased approximately $5.8 million for 2010 as compared to 2009. Interest income decreased approximately $1.2 million in 2011 as compared to 2010 and decreased approximately $0.9 million in 2010 as compared to 2009. The decreases were primarily due to a decline in interest income on our mezzanine loan portfolio due to lower balances of outstanding mezzanine loans due in part to the conversion of mezzanine loans into additional equity interests in certain of our joint ventures in 2010 and 2009.

Other income decreased approximately $2.8 million in 2011 as compared to 2010 and increased approximately $6.7 million for 2010 as compared to 2009. The changes between periods were due to approximately $2.7 million recognized in 2010 relating to the expiration of an indemnification provision in an operating joint venture agreement which expired in January 2010, and approximately $4.2 million recognized in 2010 as a result of the dissolution of a joint venture and purchase by our joint venture partner of the third-party debt made by this joint venture from the note holder, which relieved us from our guarantee of our proportionate interest of this debt; we had previously recorded a charge for this indemnification. During the first quarter of 2011, we recognized approximately $4.3 million in other income from the sale of an available-for-sale investment.

Our deferred compensation plans earned income of approximately $6.8 million, $11.6 million and $14.6 million in 2011, 2010 and 2009, respectively. The changes were related to the performance of the investments held in the deferred compensation plans for plan participants and were directly offset by the expense related to these plans, as set forth in the table below.

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Other expenses

		September 30,		September 30,		September 30,			September 30,			September 30,		September 30,		September 30,			September 30,
	Year Ended December 31,				Change						Year Ended December 31,				Change
($ in thousands)	2011		2010		$			%			2010		2009		$			%
Property management	$	20,686	$	19,982	$	704			3.5	%	$	19,982	$	18,864	$	1,118			5.9	%
Fee and asset management		5,935		4,841		1,094			22.6			4,841		4,878		(37	)		(0.8	)
General and administrative		35,456		30,762		4,694			15.3			30,762		31,243		(481	)		(1.5	)
Interest		112,414		125,893		(13,479	)		(10.7	)		125,893		128,296		(2,403	)		(1.9	)
Depreciation and amortization		179,867		170,362		9,505			5.6			170,362		168,845		1,517			0.9
Amortization of deferred financing costs		5,877		4,102		1,775			43.3			4,102		3,925		177			4.5
Expense on deferred compensation plans		6,773		11,581		(4,808	)		(41.5	)		11,581		14,609		(3,028	)		(20.7	)
Total other expenses	$	367,008	$	367,523	$	(515	)		(0.1	%)	$	367,523	$	370,660	$	(3,137	)		(0.8	%)

Property management expense, which represents regional supervision and accounting costs related to property operations, increased approximately $0.7 million for the year ended December 31, 2011 as compared to 2010 and increased approximately $1.1 million for 2010 as compared to 2009. The increases as compared to the prior year periods were primarily due to higher salaries, benefits and incentive compensation for our property management personnel. Property management expenses were 3.2%, 3.3%, and 3.1% of total property revenues for the years ended December 31, 2011, 2010, and 2009, respectively.

Fee and asset management expense, which represents expenses related to third-party construction projects and development projects and property management of our joint venture communities, increased approximately $1.1 million for the year ended December 31, 2011 as compared to 2010. This increase was primarily due to an increase in expenses resulting from the acquisitions completed by our Funds during 2011 and the fourth quarter of 2010. These increases were partially offset by a decrease in expenses resulting from our consolidation of three joint venture communities during the second half of 2010, which were previously accounted for in accordance with the equity method of accounting. Fee and asset management expense was relatively flat in 2010 as compared to 2009 due in part to an increase in fees earned on third-party construction activities, offset by decreases in development and construction fees related to our development joint ventures as compared to 2009 due to the completion of construction activities during 2009 and 2010.

General and administrative expenses increased approximately $4.7 million during the year ended December 31, 2011 as compared to 2010 and decreased approximately $0.5 million during the year ended December 31, 2010 as compared to 2009. General and administrative expenses were 5.3%, 5.0% and 5.1% of total revenues, excluding income on deferred compensation plans, for the years ended December 31, 2011, 2010 and 2009, respectively. The increase in 2011 was primarily due to awards of $2.1 million in one-time bonuses to all non-executive employees in the first quarter of 2011 and increases in salaries, benefits and incentive compensation of approximately $3.2 million, offset partially by approximately $0.5 million decrease in other discretionary expenses. The decrease in 2010 as compared to 2009 was primarily due to a decrease in legal costs and other discretionary expenses, $1.6 million in severance payments made in connection with a reduction in force of certain construction and development staff in January 2009, and separation costs relating to the retirement of one executive officer during the fourth quarter of 2009. These decreases were partially offset by an increase in long-term incentive compensation of approximately $1.6 million as compared to 2009.

The decrease in interest expense in 2011 as compared to 2010 was due to the retirement of unsecured notes payable during 2010 and 2011 and the repayment of our $500 million term loan in June 2011. Additionally, the decrease was due to higher capitalized interest of approximately $3.1 million as compared to 2010 primarily due to higher average balances in our development pipeline. These decreases were partially offset by additional interest expense related to the issuance of $500 million in senior unsecured notes in June 2011. These decreases were also partially offset by an increase in secured notes payable relating to debt assumed in connection with the consolidation of two joint venture communities during the second half of 2010, which were previously accounted for using the equity method of accounting.

The decrease in interest expense in 2010 as compared to 2009 was primarily due to using the net proceeds of $272.1 million from the equity offering completed during the second quarter of 2009 and approximately $231.7 million in net proceeds from our ATM program during 2010 to retire outstanding debt, prior to its maturity, of approximately $325.0 million during the first six months of 2009 and repay maturing secured and unsecured notes

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during 2009 and 2010, as well as reduce the balances outstanding on our unsecured line of credit. The decrease was partially offset by additional interest expense incurred on our $420 million credit facility entered into during the second quarter of 2009 and additional interest expense relating to secured debt assumed in connection with the consolidation of two joint venture communities during the second half of 2010, which were previously accounted for using the equity method of accounting. The decrease was also partially offset by lower capitalized interest of approximately $4.6 million in 2010 as compared to 2009 primarily due to the completion of communities in our development pipeline and our decision in fiscal year 2009 to postpone the development of land holdings for eight future projects.

Depreciation and amortization expense increased approximately $9.5 million during the year ended December 31, 2011 as compared to 2010 and increased approximately $1.5 million during the year ended December 31, 2010 as compared to 2009. The increases were primarily due to depreciation on capital improvements placed in service throughout 2011, 2010 and 2009. The increases were also due to the consolidation of three joint venture communities during the second half of 2010, which were previously accounted for using the equity method of accounting.

Amortization of deferred financing costs increased approximately $1.8 million during the year ended December 31, 2011 as compared to 2010 and increased approximately $0.2 million during the year ended December 31, 2010 as compared to 2009. The increase for 2011 was due to the amortization of additional financing costs incurred on our $500 million unsecured credit facility we entered into in August 2010 and on our offering of $500 million senior unsecured notes completed in June 2011. The increase was also due to the write-off of approximately $0.5 million of unamortized loan costs associated with the $500 million term loan we repaid in June 2011. The increase for 2010 as compared to 2009 was primarily due to additional financing costs incurred on our $500 million unsecured credit facility entered into in August 2010, and on our $420 million credit facility entered into the second quarter of 2009. These increases were partially offset by lower amortization of deferred financing costs related to the repurchase and retirement of certain series of notes during 2010 and 2009.

Our deferred compensation plans incurred expenses of approximately $6.8 million, $11.6 million and $14.6 million in 2011, 2010 and 2009, respectively. The changes were related to the performance of the investments held in the deferred compensation plans for plan participants and were directly offset by the income related to these plans, as discussed above.

Other

		September 30,			September 30,			September 30,			September 30,			September 30,			September 30,			September 30,			September 30,
	Year Ended December 31,						Change						Year Ended December 31,						Change
($ in thousands)	2011			2010			$			%			2010			2009			$			%
Loss on discontinuation of hedging relationship	$	(29,791	)	$	—		$	(29,791	)		*	%	$	—		$	—		$	—			—
Gain on sale of properties, including land		4,748			236			4,512			*			236			—			236			*
Gain on sale of unconsolidated joint venture interests		1,136			—			1,136			*			—			—			—			—
Loss on early retirement of debt		—			—			—			—			—			(2,550	)		2,550			100.0
Impairment associated with land development activities		—			—			—			—			—			(85,614	)		85,614			100.0
Impairment provision on technology investment		—			(1,000	)		1,000			100.0			(1,000	)		—			(1,000	)		*
Equity in income (loss) of joint ventures		5,679			(839	)		6,518			*			(839	)		695			(1,534	)		(220.7	)
Income tax expense – current		(2,220	)		(1,581	)		(639	)		(40.4	)		(1,581	)		(967	)		(614	)		(63.5	)

* Not a meaningful percentage.

The loss on discontinuation of hedging relationship was due to the discontinuation of a cash flow hedge associated with the repayment of our $500 million term loan in June 2011. Refer to Note 10, “Derivative Instruments and Hedging Activities” in the notes to condensed consolidated financial statements for further discussion.

The $4.7 million gain on sale of properties, including land, in 2011 was due to a sale of one of our land development properties located in Washington, DC in April 2011 to one of the Funds and the sale of one of our development properties located in Austin, Texas to this Fund in June 2011. The $0.2 million gain in 2010 was due to a gain on the sale of a land parcel in Houston, Texas to an unaffiliated third-party.

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Gain on sale of unconsolidated joint venture interests totaled approximately $1.1 million for the year ended December 31, 2011 due to the sale of our ownership interests in three unconsolidated joint ventures in March 2011.

Loss on early retirement of debt was approximately $2.6 million for the year ended December 31, 2009 due to the repurchase and retirement of approximately $325.0 million of various unsecured and secured notes from unrelated third parties for approximately $327.5 million during the first two quarters of 2009. The loss on early retirement of debt for these transactions also includes reductions for the write-off of applicable loan costs.

The impairment associated with land development activities for the year ended December 31, 2009 of approximately $85.6 million includes approximately $72.2 million related to land holdings for eight projects, and approximately $13.4 million related to a land development joint venture we put on hold. These impairment charges for land are the difference between each parcel’s estimated fair value and the carrying value. There were no impairments associated with land development activities for the years ended December 31, 2011 and 2010.

During the fourth quarter of 2010, we wrote-off a $1.0 million investment associated with a technology investment which we determined was no longer recoverable.

Equity in income (loss) of joint ventures increased approximately $6.5 million for the year ended December 31, 2011 as compared to 2010, and decreased approximately $1.5 million for the year ended December 31, 2010 as compared to 2009. The increase in 2011 was primarily due to a $6.4 million gain recognized in equity in income (loss) of joint ventures relating to the sale of four operating properties by one of our unconsolidated joint ventures during the fourth quarter of 2011. The increase was also due to two development properties held by our joint ventures which were sold in March 2011. These two development properties reached stabilization in late 2010 and early 2011 and we recognized our proportionate interest in losses in 2010 during the lease-up phase of operations. These increases were partially offset by our proportionate interest in overall losses recognized by the Funds relating to acquisitions of operating properties during 2010 and 2011, which resulted in additional amortization expense for in-place leases over the underlying lease term. The decrease for 2010 as compared to 2009 was primarily the result of decreases in earnings by our stabilized operating joint ventures due to declines in rental income, and the recognition of net operating losses by certain development joint ventures during the lease-up phase of operations. The decreases were further impacted by the consolidation of three operating joint ventures during the second half of 2010, which were previously accounted for in accordance with the equity method of accounting. These decreases were partially offset by increases in earnings in development joint ventures reaching or nearing stabilization during 2009 and 2010.

We had current income tax expense of approximately $2.2 million, $1.6 million, and $1.0 million for the tax years ended December 31, 2011, 2010, and 2009, respectively. The increase in income tax during 2011 was due to approximately $1.0 million associated with income taxes from the gain recognized on the sale of our available-for-sale investment during the first quarter of 2011 by a taxable REIT subsidiary. This increase was partially offset by a decrease in taxable income related to our third-party construction activities conducted in a taxable REIT subsidiary. The increase in taxes in 2010 as compared to 2009 primarily related to an increase in federal income taxes resulting from increased profitability in our third-party construction activities conducted in a taxable REIT subsidiary.

Noncontrolling interests

		September 30,			September 30,			September 30,		September 30,			September 30,			September 30,			September 30,		September 30,
	Year Ended December 31,						Change					Year Ended December 31,						Change
($ in thousands)	2011			2010			$		%			2010			2009			$		%
(Income) loss allocated to noncontrolling interests from continuing operations	$	(3,582	)	$	(926	)	$	2,656		286.8	%	$	(926	)	$	403		$	1,329		329.8	%
(Income) allocated to perpetual preferred units		(7,000	)		(7,000	)		—		—			(7,000	)		(7,000	)		—		—

Income allocated to noncontrolling interests from continuing operations increased approximately $2.7 million in 2011 as compared to 2010, and increased approximately $1.3 million in 2010 as compared to 2009. The increase for 2011 was primarily due to an increase in earnings from a fully-consolidated joint venture which reached stabilization during the third quarter of 2010, of which we hold a 25% ownership. The increase was also due to increased earnings associated with properties held by our operating partnerships during 2011 as compared to 2010. During 2009, we recognized an approximately $72.2 million impairment associated with land holdings for eight projects we had put on hold, of which $3.6 million represented certain operating partnerships’ interests in the impairment. Excluding this impairment charge, income allocated to noncontrolling interests from continuing operations decreased approximately $2.3 million in 2010 as compared to 2009. The $2.3 million decrease in 2010

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as compared to 2009 was primarily due to the completion during the three months ended March 31, 2010 and subsequent lease-up of a property by a fully consolidated joint venture of which we retain a 25% ownership, which resulted in our recording depreciation and interest expense on the property, upon completion of construction, in excess of income recognized during the lease-up period. The decrease was also due to lower earnings associated with properties held by operating partnerships during 2010 as compared to 2009.

Funds from Operations (“FFO”)

Management considers FFO to be an appropriate measure of the financial performance of an equity REIT. The National Association of Real Estate Investment Trusts (“NAREIT”) currently defines FFO as net income (computed in accordance with accounting principles generally accepted in the United States of America (“GAAP”)), excluding gains (or losses) associated with the sale of previously depreciated operating properties, real estate depreciation and amortization, impairments of depreciable assets, and adjustments for unconsolidated joint ventures. Our calculation of diluted FFO also assumes conversion of all potentially dilutive securities, including certain noncontrolling interests, which are convertible into common shares. We consider FFO to be an appropriate supplemental measure of operating performance because, by excluding gains or losses on dispositions of operating properties, depreciation, and impairments of depreciable assets, FFO can help one compare the operating performance of a company’s real estate investments between periods or as compared to different companies.

To facilitate a clear understanding of our consolidated historical operating results, we believe FFO should be examined in conjunction with net income attributable to common shareholders as presented in the consolidated statements of income (loss) and comprehensive income and data included elsewhere in this report. FFO is not defined by GAAP and should not be considered as an alternative to net income attributable to common shareholders as an indication of our operating performance. Additionally, FFO as disclosed by other REITs may not be comparable to our calculation.

Reconciliations of net income attributable to common shareholders to diluted FFO for the years ended December 31 are as follows:

		September 30,			September 30,			September 30,
(in thousands)	2011			2010			2009
Funds from operations
Net income (loss) attributable to common shareholders (1)	$	49,379		$	23,216		$	(50,800	)
Real estate depreciation and amortization, including discontinued operations		177,187			170,660			170,480
Adjustments for unconsolidated joint ventures		10,534			8,943			7,800
Gain on sale of properties and discontinued operations, net of tax		(24,621	)		(9,614	)		(16,887	)
Gain on sale of unconsolidated joint venture properties (2)		(6,394	)		—			—
Gain on sale of unconsolidated joint venture interests		(1,136	)		—			—
Income (loss) allocated to noncontrolling interests		2,586			1,104			(646	)
Funds from operations – diluted	$	207,535		$	194,309		$	109,947
Weighted average shares – basic		72,756			68,608			62,359
Incremental shares issuable from assumed conversion of:
Common share options and share awards granted		706			348			55
Common units		2,466			2,596			2,852
Weighted average shares – diluted		75,928			71,552			65,266

(1) Includes a $29.8 million charge related to a loss on discontinuation of a hedging relationship for the year ended December 31, 2011 and an $85.6 million impairment associated with land development activities for the year ended December 31, 2009.

(2) Represents our proportionate share of the gain on sale relating to one of our unconsolidated joint venture’s sale of four operating properties during the fourth quarter 2011.

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Liquidity and Capital Resources

Financial Condition and Sources of Liquidity

We intend to maintain a strong balance sheet and preserve our financial flexibility, which we believe should enhance our ability to identify and capitalize on investment opportunities as they become available. We intend to maintain what management believes is a conservative capital structure by:

• extending and sequencing the maturity dates of our debt where practicable;

• managing interest rate exposure using what management believes to be prudent levels of fixed and floating rate debt;

• maintaining what management believes to be conservative coverage ratios; and

• using what management believes to be a prudent combination of debt and equity.

Our interest expense coverage ratio, net of capitalized interest, was approximately 3.2 times for the year ended December 31, 2011 and approximately 2.6 times for each of the years ended December 31, 2010 and 2009. This ratio is a method for calculating the amount of operating cash flows available to cover interest expense and is calculated by dividing interest expense for the period into the sum of property revenues and expenses, non-property income, other expenses, income from discontinued operations after adding back depreciation, amortization, and interest expense from both continuing and discontinued operations. At December 31, 2011, 2010, and 2009, approximately 71.7%, 71.1%, and 72.8%, respectively, of our properties (based on invested capital) were unencumbered. Our weighted average maturity of debt, including our line of credit, was 6.8 years at December 31, 2011.

For the longer term, we intend to continue to focus on strengthening our capital and liquidity position by generating positive cash flows from operations, maintaining appropriate debt levels and leverage ratios, and controlling overhead costs.

Our primary source of liquidity is cash flow generated from operations. Other sources include available cash balances, the availability under our unsecured credit facility and other short-term borrowings, proceeds from dispositions of properties and other investments, and the use of debt and equity offerings under our automatic shelf registration statement. We believe our liquidity and financial condition are sufficient to meet all of our reasonably anticipated cash needs during 2012 including:

• normal recurring operating expenses;

• current debt service requirements;

• recurring capital expenditures;

• initial funding of property developments, acquisitions, joint venture investments; and

• the minimum dividend payments required to maintain our REIT qualification under the Code.

Factors which could increase or decrease our future liquidity include but are not limited to volatility in capital and credit markets, sources of financing, our ability to complete asset sales, the effect our debt level and decreases in credit ratings could have on our costs of funds and our ability to access capital markets.

Cash Flows

Certain sources and uses of cash, such as the level of discretionary capital expenditures, and repurchases of debt and common shares, are within our control and are adjusted as necessary based upon, among other factors, market conditions. The following is a discussion of our cash flows for the years ended December 31, 2011 and 2010.

Net cash provided by operating activities was approximately $244.8 million during the year ended December 31, 2011 as compared to approximately $224.0 million during the year ended December 31, 2010. The increase was primarily due to growth in property revenues directly attributable to increased rental and occupancy rates from our stabilized communities and the growth in non-stabilized communities as we consolidated three joint ventures during the second half of 2010. This increase in revenues was partially offset by the increase in property expenses from our stabilized and non-stabilized communities which include the property expenses of these three

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joint ventures. See further discussions of our 2011 operations as compared to 2010 in our “Results of Operations.” The increase was further offset by a decrease in net cash from operating activities due to the timing of payments in operating accounts, primarily relating to the timing of payments relating to third-party construction activities and the timing of interest payments. These decreases from operating activities were partially offset by the timing of accounts receivable receipts relating to third-party construction activities.

Net cash used by investing activities during the year ended December 31, 2011 totaled approximately $187.4 million as compared to net cash provided by investing activities of approximately $35.2 million during the year ended December 31, 2010. Cash outflows for property development, acquisition, and capital improvements were approximately $227.8 million during 2011 as compared to approximately $63.7 million during 2010 due primarily to an increase in construction and development activity in 2011 as compared to 2010 and the acquisitions of 30.1 acres of land for approximately $40.1 million in August 2011 and 2.2 acres of land for approximately $21.4 million in December 2011. Additionally, cash outflows for investments in joint ventures were approximately $46.0 million during the year ended December 31, 2011 primarily relating to eighteen acquisitions completed by our Funds, in which we own a 20% interest, compared to approximately $6.5 million for the year ended December 31, 2010. These outflows were partially offset by proceeds of approximately $19.3 million from the sale of our interests in three unconsolidated joint ventures in March 2011. These outflows were further offset by proceeds received from the sale of our available-for-sale investment of $4.5 million during February 2011, payments received on notes receivable from affiliates of approximately $3.3 million and approximately $6.0 million in distributions of investments from our joint ventures which included cash distributions of approximately $2.0 million received from an unconsolidated joint venture’s sale of operating properties in the fourth quarter of 2011. Cash inflows from sales of properties including land and discontinued operations were approximately $57.3 million for the year ended December 31, 2011 as compared to approximately $102.8 million for the year ended December 31, 2010. During 2011, we received proceeds of approximately $19.1 million from the sale of two land development properties to one of our joint ventures, and approximately $38.2 million from the sale of two operating properties to unaffiliated third parties. During 2010, we received proceeds of approximately $102.8 million from the sale of two operating properties and one land holding to unaffiliated third parties.

Net cash used in financing activities totaled approximately $172.9 million during the year ended December 31, 2011 as compared to $152.8 million during the year ended December 31, 2010. During 2011, we used approximately $627.6 million to repay our outstanding $500 million term loan in June 2011 and approximately $127.6 million to retire maturing secured and unsecured notes. Also during 2011, approximately $152.2 million was used for distributions paid to common shareholders, perpetual preferred unit holders, and noncontrolling interest holders. During this same period, net proceeds of approximately $495.7 million was provided from the issuance of two series of unsecured notes completed in June 2011, and net proceeds of approximately $106.6 million from the issuance of 1.7 million common shares under our at-the-market (“ATM”) share offering programs which offset these cash outflows. These cash outflows were further offset by proceeds from common share options exercised during the period of approximately $11.4 million.

Financial Flexibility

In September 2011, we amended our $500 million unsecured credit facility to extend the maturity date from August 2012 to September 2015 with an option to extend to September 2016. Additionally, we now have the option to increase this credit facility to $750 million by either adding additional banks to the credit facility or obtaining the agreement of existing banks to increase their commitments. The interest rate is based upon LIBOR plus a margin which is subject to change as our credit ratings change. Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates. These bid rate loans have terms of 180 days or less and may not exceed the lesser of $250 million or the remaining amount available under the line of credit. The line of credit is subject to customary financial covenants and limitations, with which we are in compliance.

Our line of credit provides us with the ability to issue up to $100 million in letters of credit. While our issuance of letters of credit does not increase our borrowings outstanding under our line of credit, it does reduce the amount available. At December 31, 2011, we had outstanding letters of credit totaling approximately $10.4 million, leaving approximately $489.6 million available under our unsecured line of credit.

We currently have an automatic shelf registration statement on file with the SEC which allows us to offer, from time to time, an unlimited amount of common shares, preferred shares, debt securities, or warrants. Our declaration of trust provides we may issue up to 110.0 million shares of beneficial interest, consisting of 100.0 million common shares and 10.0 million preferred shares. As of December 31, 2011, we had approximately 72.0

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million common shares outstanding, net of treasury shares and shares held in our deferred compensation arrangements, and no preferred shares outstanding. In January 2012, we issued approximately 6.6 million common shares in a public equity offering and received approximately $391.6 million in net proceeds.

In March 2010, we announced the creation of an ATM share offering program through which we could, but had no obligation to, sell common shares having an aggregate offering price of up to $250 million (“2010 ATM program”), in amounts and at times as we determined, into the existing trading market at current market prices as well as through negotiated transactions. The 2010 ATM program was terminated and no further common shares are available for sale under the 2010 ATM program.

In May 2011, we created a second ATM share offering program through which we can sell common shares having an aggregate offering price of up to $300 million (“2011 ATM program”) from time to time into the existing trading market at current market prices as well as through negotiated transactions. We may, but have no obligation to, sell common shares through the 2011 ATM share offering program in amounts and at times as we determine. Actual sales from time to time may depend on a variety of factors, including, among others, market conditions, the trading price of our common shares, and determinations of the appropriate sources of funding for us. As of the day of this filing, we had common shares having an aggregate offering price of up to $202.4 million remaining available for sale under the 2011 ATM program.

We believe our ability to access capital markets is enhanced by our senior unsecured debt ratings by Moody’s and Standard and Poor’s, which are currently Baa1 and BBB, respectively, with stable outlooks, as well as by our ability to borrow on a secured basis from various institutions including banks, Fannie Mae, Freddie Mac, or life insurance companies. However, we may not be able to maintain our current credit ratings and may not be able to borrow on a secured or unsecured basis in the future.

Future Cash Requirements and Contractual Obligations

One of our principal long-term liquidity requirements includes the repayment of maturing debt, including any future borrowings under our unsecured line of credit. During 2012, approximately $294.2 million of unsecured debt, including scheduled principal amortizations of approximately $3.5 million, are scheduled to mature. Included in these maturities are four debt instruments of approximately $102.1 million which have automatic one year extensions which we may or may not exercise at our election. See Note 9, “Notes Payable,” in the Notes to Consolidated Financial Statements for further discussion of scheduled maturities. Additionally, we intend to incur approximately $180.0 million of additional capital expenditures on our current development projects. We intend to meet our near-term liquidity requirements through available cash balances, cash flows generated from operations, draws on our unsecured credit facility, proceeds from property dispositions and secured mortgage notes, equity issued from our 2011 ATM program, and the use of debt and equity offerings under our automatic shelf registration statement.

In order for us to continue to qualify as a REIT, we are required to distribute annual dividends to our shareholders equal to a minimum of 90% of our REIT taxable income, computed without regard to the dividends paid deduction and our net capital gains. In December 2011, we announced our Board of Trust Managers had declared a dividend distribution of $0.49 per share to our common shareholders of record as of December 19, 2011. The dividend was subsequently paid on January 17, 2012. We paid equivalent amounts per unit to holders of common operating partnership units. When aggregated with previous 2011 dividends, this distribution to common shareholders and holders of common operating partnership units equates to an annual dividend rate of $1.96 per share or unit for the year ended December 31, 2011.

The following table summarizes our known contractual cash obligations as of December 31, 2011:

		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,
(in millions)	Total		2012		2013		2014		2015		2016		Thereafter
Debt maturities (1)	$	2,432.1	$	294.2	$	228.0	$	11.0	$	252.4	$	2.6	$	1,643.9
Interest payments (2)		725.2		115.6		101.5		90.4		83.2		75.6		258.9
Non-cancelable lease payments		9.3		2.4		2.4		2.2		1.4		0.2		0.7
Postretirement benefit obligations		3.7		0.2		0.2		0.2		0.2		0.2		2.7
	$	3,170.3	$	412.4	$	332.1	$	103.8	$	337.2	$	78.6	$	1,906.2

(1) Includes scheduled principal amortizations and does not include all available extension options.

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(2) Includes contractual interest payments for our senior unsecured notes, medium-term notes, and secured notes. The interest payments on certain secured notes with floating interest rates were calculated based on the interest rates in effect as of December 31, 2011 or the most recent practicable date.

In January 2012, we issued approximately 6.6 million common shares in a public equity offering and received approximately $391.6 million in net proceeds. We utilized these proceeds to fund the acquisition of the 80% interest not owned by us in twelve related joint ventures for approximately $99.5 million and the repayment of approximately $272.6 million in mortgage debt associated with these joint ventures.

In February 2012, we redeemed the 4.0 million outstanding 7.0% Series B Cumulative Redeemable Perpetual Preferred Units at their redemption price of $25.00 per unit, or an aggregate of $100.0 million, plus accrued and unpaid distributions. In connection with this redemption, we expensed the unamortized issuance costs relating to these Series B units, which will result in a charge to earnings of approximately $2.1 million in the first quarter of 2012.

Off-Balance Sheet Arrangements

The joint ventures in which we have an interest have been funded in part with secured, third-party debt. As of December 31, 2011, we have no outstanding guarantees related to loans of our unconsolidated joint ventures.

Inflation

Substantially all of our apartment leases are for a term generally ranging from six to fifteen months. In an inflationary environment, we may realize increased rents at the commencement of new leases or upon the renewal of existing leases. We believe the short-term nature of our leases generally minimizes our risk from the adverse effects of inflation.

Critical Accounting Policies

The preparation of our financial statements in conformity with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the balance sheet date, and the amounts of revenues and expenses recognized during the reporting period. These estimates are based on historical experience and other assumptions believed to be reasonable under the circumstances. The following is a discussion of our critical accounting estimates. For a discussion of all of our significant accounting policies, see Note 2 to the accompanying consolidated financial statements.

Use of Estimates. In the application of GAAP, management is required to make estimates and assumptions which affect the reported amounts of assets and liabilities at the date of the financial statements, results of operations during the reporting periods, and related disclosures. Our more significant estimates include estimates supporting our impairment analysis related to the carrying values of our real estate assets, and estimates related to the valuation of our investments in joint ventures. These estimates are based on historical experience and other assumptions believed to be reasonable under the circumstances. Future events rarely develop exactly as forecasted, and the best estimates routinely require adjustment.

Principles of Consolidation. We may enter into various joint venture agreements with unrelated third parties to hold or develop real estate assets. We must determine for each of these joint ventures whether to consolidate the entity or account for our investment under the equity or cost basis of accounting. Investments acquired or created are continuously evaluated based on the accounting guidance relating to variable interest entities (“VIEs”), which requires the consolidation of VIEs in which we are considered to be the primary beneficiary. If the investment is determined not to be a VIE, then the investment is evaluated for consolidation (primarily using a voting interest model) under the remaining consolidation guidance relating to real estate entities. If we are the general partner in a limited partnership, or manager of a limited liability company, we also consider the consolidation guidance relating to the rights of limited partners (non-managing members) to assess whether any rights held by the limited partners overcome the presumption of control by us. We evaluate our accounting for investments on a quarterly basis or when a reconsideration event (as defined in GAAP) with respect to our investments occurs. The analysis required to identify VIEs and primary beneficiaries is complex and requires substantial management judgment. Accordingly, we believe the decisions made to choose an appropriate accounting framework are critical.

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Asset Impairment. Long-lived assets are reviewed for impairment annually or whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Impairment exists if estimated future undiscounted cash flows associated with long-lived assets are not sufficient to recover the carrying value of such assets. We consider projected future discounted and undiscounted cash flows, trends, strategic decisions regarding future development plans, and other factors in our assessment of whether impairment conditions exist. When impairment exists, the long-lived asset is adjusted to its fair value. While we believe our estimates of future cash flows are reasonable, different assumptions regarding a number of factors, including market rents, economic conditions, and occupancies could significantly affect these estimates. In estimating fair value, management uses appraisals, management estimates, and discounted cash flow calculations which maximize inputs from a marketplace participant’s perspective.

In addition, we evaluate our equity investments in joint ventures and if we believe there is an other than temporary decline in market value of our investment, we will record an impairment charge.

The value of our properties under development depends on market conditions, including estimates of the project start date as well as estimates of demand for multifamily communities. We have reviewed market trends and other marketplace information and have incorporated this information as well as our current outlook into the assumptions we use in our impairment analyses. Due to the judgment and assumptions applied in the impairment analyses, it is possible actual results could differ substantially from those estimated.

We believe the carrying value of our operating real estate assets, properties under development, and land is currently recoverable. However, if market conditions deteriorate or if changes in our development strategy significantly affect any key assumptions used in our fair value calculations, we may need to take material charges in future periods for impairments related to existing assets. Any such material non-cash charges could have an adverse effect on our consolidated financial position and results of operations.

Cost Capitalization. Real estate assets are carried at cost plus capitalized carrying charges. Carrying charges are primarily interest and real estate taxes which are capitalized as part of properties under development. Capitalized interest is generally based on our weighted average interest rate of our unsecured debt. Transaction costs associated with the acquisition of operating real estate assets are expensed, and expenditures directly related to the development and improvement of real estate assets are capitalized at cost as land and buildings and improvements; indirect development costs, including salaries and benefits and other related costs directly attributable to the development of properties, are also capitalized. All construction and carrying costs are capitalized and reported in the balance sheet as properties under development until the apartment homes are substantially completed. Upon substantial completion of the apartment homes, the total capitalized development cost for the apartment homes and the associated land is transferred to buildings and improvements and land, respectively. Included in capitalized costs are indirect costs associated with our development and redevelopment activities. The estimates used by management require judgment, and accordingly we believe cost capitalization to be a critical accounting estimate.

Recent Accounting Pronouncements

In May 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2011-04 (“ASU 2011-04”), “Fair Value Measurement (Topic 820), Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS.” ASU 2011-04 requires entities to separately disclose the amounts and reasons for any transfers of assets and liabilities into and out of Level 1 and Level 2 of the fair value hierarchy. For fair value measurements using significant unobservable inputs (Level 3), entities will be required to disclose quantitative information about the significant unobservable inputs used for all Level 3 measurements and a description of the valuation processes in determining fair value. In addition, ASU 2011-04 requires entities to provide a qualitative discussion about the sensitivity of recurring Level 3 measurements to changes in the unobservable inputs disclosed, including the interrelationship between inputs. Entities will also be required to disclose information about when the current use of a non-financial asset measured at fair value differs from its highest and best use and the hierarchy classification for items whose fair value is not recorded on the balance sheet but is disclosed in the notes. We do not anticipate changes to our existing classification and measurement of fair value when the amended standard becomes effective on January 1, 2012; however, we do expect our disclosures will be expanded as a result.

In June 2011, the FASB issued Accounting Standards Update 2011-05 (“ASU 2011-05”), “Presentation of Comprehensive Income.” ASU 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of changes in stockholders’ equity and requires all nonowner changes in stockholders’ equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. Additionally, ASU 2011-05 requires an entity to present reclassification adjustments on the face of the financial statements from other comprehensive income to net income. ASU 2011-05 is effective for us beginning January 1, 2012. We do not expect ASU 2011-05 to have a material effect on our financial statements as we currently present other comprehensive income components in a separate but consecutive statement.

In December 2011, the FASB issued Accounting Standards Update 2011-10 (“ASU 2011-10”), “Property Plant & Equipment (Topic 360): Derecognition of In-Substance Real Estate - a Scope Clarification,” ASU 2011-10 resolves the diversity in practice about whether the guidance under FASB Accounting Standards Codification (“ASC”) Subtopic 360-20, “Property, Plant, and Equipment - Real Estate Sales,” applies to the derecognition of in substance real estate when a parent ceases to have a controlling financial interest in a subsidiary, as specified under ASC Subtopic 810-10, “Non-Controlling Interests in Consolidated Financial Statements - an amendment of ARB No. 51,” that is in substance real estate as a result of default by the subsidiary on its nonrecourse debt. The new guidance is intended to emphasize the accounting for such transactions which is based upon substance over form. ASU 2011-10 is effective for us beginning July 1, 2012 and is not expected to have a material effect on our financial statements.

In December 2011, the FASB issued Accounting Standards Update 2011-12 (“ASU 2011-12”), “Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05.” ASU 2011-12 indefinitely defers the requirements for entities to present reclassification adjustments out of accumulated other comprehensive income by component in both the statement in which net income is presented and the statement in which other comprehensive income is presented. Entities will still be required to comply with the other aspects of ASU 2011-05 as noted above. ASU 2011-12 is effective for us beginning January 1, 2012 and is not expected to have a material effect on our financial statements.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

We are exposed to certain market risks inherent in our operations. These risks generally arise from transactions entered into in the normal course of business. We believe our primary market risk exposure relates to interest rate risk. We do not enter into derivatives or other financial instruments for trading or speculative purposes.

The table below provides information about our assets and our liabilities sensitive to changes in interest rates as of December 31, 2011 and 2010:

		September 30,		September 30,		September 30,			September 30,			September 30,		September 30,		September 30,			September 30,
	December 31, 2011										December 31, 2010
	Amount (in  millions)		Weighted Average Maturity (in years)		Weighted Average Interest Rate			% Of Total			Amount (in  millions)		Weighted Average Maturity (in years)		Weighted Average Interest Rate			% Of Total
Fixed rate debt (1)	$	2,186.6		6.7		5.3	%		89.9	%	$	2,333.5		5.2		5.4	%		91.0	%
Variable rate debt		245.5		7.6		1.1			10.1			230.3		9.0		1.3			9.0

(1) December 31, 2010 included a $500 million term loan entered into in 2007 and $16.6 million of a construction loan entered into in 2008 which are effectively fixed by the use of interest rate swaps. The $500 million term loan was repaid in June. The $16.6 million construction loan interest rate swap matured and was not extended in conjunction with the one-year extension of the loan in July 2011.

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We have historically used variable rate indebtedness available under our revolving credit facility to initially fund acquisitions and our development pipeline. To the extent we utilize our revolving credit facility and increase our variable rate indebtedness, our exposure to increases in interest rates will also increase.

For fixed rate debt, interest rate changes affect the fair market value but do not impact net income attributable to common shareholders or cash flows. Conversely, for floating rate debt, interest rate changes generally do not affect the fair market value but do impact net income attributable to common shareholders and cash flows, assuming other factors are held constant. Holding other variables constant, a one percentage point variance in interest rates would change the unrealized fair market value of the fixed rate debt by approximately $119.6 million. The net income attributable to common shareholders and cash flows impact on the next year resulting from a one percentage point variance in interest rates on floating rate debt would be approximately $2.5 million, holding all other variables constant.

We have entered into, and may enter into in the future, interest rate swaps and caps to protect ourselves against fluctuations in the rates of our floating rate debt. In connection with the repayment of the $500 million loan in June 2011, we discontinued the hedging relationship on the $500 million interest rate swap on May 31, 2011. Upon repayment of the loan, which eliminated the probable future variable monthly interest payments being hedged, we recognized a non-cash charge of approximately $29.8 million which included the accelerated reclassification of amounts previously recorded in accumulated other comprehensive loss related to this swap. Due to the relatively short remaining life of the swap (which matures in October 2012) and the low expectation of the swap becoming a significantly larger liability, management elected to leave this interest rate swap in place through its original maturity rather than cash settle the swap. As a result, the changes in fair value of this swap have been marked to market through earnings in other income and other expense. The fair value of our interest rate swap totaled approximately $16.6 million as of December 31, 2011. During 2011, we recorded a loss of approximately $0.2 million related to this derivative instrument subsequent to the discontinuation of the hedging relationship.

Non-designated derivative financial instruments could expose us to credit risk and market risk. Our credit risk in this context is the failure of a counterparty to perform under the terms of the derivative contract. If the fair value of a derivative contract is positive, the counterparty would owe us, which could create credit risk for us. If the fair value of a derivative is negative we would owe the counterparty and, therefore, we would not be exposed to credit risk. We believe we minimize our credit risk on these transactions by dealing with major, creditworthy financial institutions. As part of our on-going control procedures, we monitor the credit ratings of counterparties and our exposure to any single entity, thus minimizing credit risk concentration. We believe the likelihood of realized losses from counterparty non-performance is remote. Our market risk related to derivative financial instruments is the adverse effect on the value of a financial instrument which results from changes in interest rates. We believe we minimize our market risk by monitoring the fair value of each financial instrument position.

Item 8. Financial Statements and Supplementary Data

Our response to this item is included in a separate section at the end of this report beginning on page F-1.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Evaluation of disclosure controls and procedures. We carried out an evaluation, under the supervision and with the participation of our management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report pursuant to Securities Exchange Act ("Exchange Act") Rules 13a-15(e) and 15d-15(e). Based on the evaluation, the Chief Executive Officer and Chief Financial Officer concluded the disclosure controls and procedures as of the end of the period covered by this report are effective to ensure information required to be disclosed by us in our Exchange Act filings is recorded, processed, summarized, and reported within the periods specified in the Securities and Exchange Commission's rules and forms and is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in internal controls. There were no changes in our internal control over financial reporting (identified in connection with the evaluation required by paragraph (d) in Rules 13a-15 and 15d-15 under the Exchange Act) during our most recent fiscal quarter which have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Management’ s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) and 15d-15(f) promulgated under the Securities Exchange Act of 1934 as follows:

A process designed by, or under the supervision of, the company’s principal executive and principal financial officers, or persons performing similar functions, and effected by the company's board of trust managers, management, and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:

• Pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company;

• Provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and board of trust managers of the company; and

• Provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Management assessed the effectiveness of our internal control over financial reporting as of December 31, 2011. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework.

Based on our assessment, management concluded our internal control over financial reporting is effective as of December 31, 2011.

Deloitte & Touche LLP, an independent registered public accounting firm, has issued an attestation report regarding the effectiveness of our internal control over financial reporting, which is included herein.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Trust Managers and Shareholders of

Camden Property Trust

Houston, Texas

We have audited the internal control over financial reporting of Camden Property Trust and subsidiaries (the “Company”) as of December 31, 2011, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed by, or under the supervision of, the company’s principal executive and principal financial officers, or persons performing similar functions, and effected by the company’s board of trust managers, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and the board of trust managers of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of the inherent limitations of internal control over financial reporting, including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2011, based on the criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated financial statements and financial statement schedule as of and for the year ended December 31, 2011 of the Company and our report dated February 17, 2012 expressed an unqualified opinion on those financial statements and financial statement schedule.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

February 17, 2012

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Item 9B. Other Information

None.

PART III

Item 10. Directors, Executive Officers, and Corporate Governance

Information with respect to this Item 10 is incorporated by reference from our Proxy Statement, which we expect to file on or about March 22, 2012 in connection with the Annual Meeting of Shareholders to be held May 11, 2012.

Item 11. Executive Compensation

Information with respect to this Item 11 is incorporated by reference from our Proxy Statement, which we expect to file on or about March 22, 2012 in connection with the Annual Meeting of Shareholders to be held May 11, 2012.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Information with respect to this Item 12 is incorporated by reference from our Proxy Statement, which we expect to file on or about March 22, 2012 in connection with the Annual Meeting of Shareholders to be held May 11, 2012 to the extent not set forth below.

The following table gives information about the equity compensation plans as of December 31, 2011.

Equity Compensation Plan Information

		September 30,		September 30,		September 30,
Plan Category	Number of securities to be issued upon exercise of outstanding options, warrants and rights (a)		Weighted-average exercise price of outstanding options, warrants and rights (b)		Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) (c)
Equity compensation plans approved by security holders		1,339,536	$	42.27		2,628,092
Equity compensation plans not approved by security holders		—		—		—
Total		1,339,536	$	42.27		2,628,092

Incentive Compensation. During the second quarter of 2011, our Board of Trust Managers adopted, and on May 11, 2011 our shareholders approved, the 2011 Share Incentive Plan of Camden Property Trust (the “2011 Share Plan”). Under the 2011 Share Plan, we may issue up to a total of approximately 9.1 million fungible units (the “Fungible Pool Limit”), which is comprised of approximately 5.8 million new fungible units plus approximately 3.3 million fungible units previously available for issuance under our 2002 share incentive plan based on a 3.45 to 1.0 fungible unit-to full value award conversion ratio. Fungible units represent the baseline for the number of shares available for issuance under the 2011 Share Plan. Different types of awards are counted differently against the Fungible Pool Limit, as follows:

• Each share issued or to be issued in connection with an award, other than an option, right or other award which does not deliver the full value at grant of the underlying shares, will be counted against the Fungible Pool Limit as 3.45 fungible pool units;

• Options and other awards which do not deliver the full value at grant of the underlying shares and which expire more than five years from date of grant will be counted against the Fungible Pool Limit as one fungible pool unit; and

• Options, rights and other awards which do not deliver the full value at date of grant and expire five years or less from the date of grant will be counted against the Fungible Pool Limit as 0.83 of a fungible pool unit.

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As of December 31, 2011, approximately 9.1 million fungible units were available under the 2011 Share Plan, which results in approximately 2.6 million common shares which could be granted pursuant to full value awards based on the 3.45 to 1.0 fungible unit-to-full value award conversion ratio.

Item 13. Certain Relationships and Related Transactions and Director Independence

Information with respect to this Item 13 is incorporated herein by reference from our Proxy Statement, which we expect to file on or about March 22, 2012 in connection with the Annual Meeting of Shareholders to be held May  11, 2012.

Item 14. Principal Accounting Fees and Services

Information with respect to this Item 14 is incorporated herein by reference from our Proxy Statement, which we expect to file on or about March 22, 2012 in connection with the Annual Meeting of Shareholders to be held May 11, 2012.

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PART IV

Item 15. Exhibits and Financial Statement Schedules

The following documents are filed as part of this report:

(1) Financial Statements:
Report of Independent Registered Public Accounting Firm	F-1
Consolidated Balance Sheets as of December 31, 2011 and 2010	F-2
Consolidated Statements of Income (Loss) and Comprehensive Income for the Years Ended December  31, 2011, 2010, and 2009	F-3
Consolidated Statements of Equity and Perpetual Preferred Units for the Years Ended December  31, 2011, 2010, and 2009	F-5
Consolidated Statements of Cash Flows for the Years Ended December 31, 2011, 2010,and 2009	F-7
Notes to Consolidated Financial Statements	F-9
(2) Financial Statement Schedules:
Schedule III – Real Estate and Accumulated Depreciation	S-1

All other schedules have been omitted since the required information is presented in the financial statements and the related notes or is not applicable.

(3) Index to Exhibits:

The following exhibits are filed as part of or incorporated by reference into this report:

Exhibit No.	Description	Filed Herewith or Incorporated Herein by Reference (1)
3.1	Amended and Restated Declaration of Trust of Camden Property Trust	Exhibit 3.1 to Form 10-K for the year ended December 31, 1993
3.2	Amendment to the Amended and Restated Declaration of Trust of Camden Property Trust	Exhibit 3.1 to Form 10-Q for the quarter ended June 30, 1997
3.3	Second Amended and Restated Bylaws of Camden Property Trust	Exhibit 3.3 to Form 10-K for the year ended December 31, 1997
3.4	Amendment to Second Amended and Restated Bylaws of Camden Property Trust	Exhibit 99.2 to Form 8-K filed on May 4, 2006
4.1	Specimen certificate for Common Shares of Beneficial Interest	Form S-11 filed on September 15, 1993 (Registration No. 33-68736)
4.2	Indenture dated as of February 15, 1996 between Camden Property Trust and The Bank of New York Trust Company of Florida, N.A. (formerly known as U.S. Trust Company of Texas, N.A.), as Trustee	Exhibit 4.1 to Form 8-K filed on February 15, 1996

43

Exhibit No.	Description	Filed Herewith or Incorporated Herein by Reference (1)
4.3	First Supplemental Indenture dated as of February 15, 1996 between Camden Property Trust and The Bank of New York Trust Company of Florida, N.A. (formerly known as U.S. Trust Company of Texas, N.A.), as Trustee	Exhibit 4.2 to Form 8-K filed on February 15, 1996
4.4	Indenture for Senior Debt Securities dated as of February 11, 2003 between Camden Property Trust and U. S. Bank National Association, as successor to SunTrust Bank, as Trustee	Exhibit 4.1 to Form S-3 filed on February 12, 2003 (Registration No. 333-103119)
4.5	First Supplemental Indenture dated as of May 4, 2007 between the Company and U.S. Bank National Association, as successor to SunTrust Bank, as trustee	Exhibit 4.2 to Form 8-K filed on May 7, 2007
4.6	Second Supplemental Indenture dated as of June 3, 2011 between the Company and U.S. Bank National Association, as successor to Sun Trust Bank, as Trustee.	Exhibit 4.3 to Form 8-K filed on June 3, 2011
4.7	Registration Rights Agreement, dated as of February 23, 1999, between Camden Property Trust and the unitholders named therein	Exhibit 99.3 to Form 8-K filed on March 10, 1999
4.8	Amendment to Registration Rights Agreement, dated as of December 1, 2003, between Camden Property Trust and the unitholders named therein	Exhibit 4.8 to Form 10-K for the year ended December 31, 2003
4.9	Registration Rights Agreement dated as of February 28, 2005 between Camden Property Trust and the holders named therein	Form S-4 filed on November 24, 2004 (Registration No. 333-120733)
4.10	Statement of Designation of Series B Cumulative Redeemable Preferred Shares of Beneficial Interest	Exhibit 4.1 to Form 8-K filed on March 10, 1999
4.11	Amendment to Statement of Designation of Series B Cumulative Redeemable Preferred Shares of Beneficial Interest, effective as of December 31, 2003	Exhibit 4.10 to Form 10-K for the year ended December 31, 2003
4.12	Form of Camden Property Trust 5.875% Note due 2012	Exhibit 4.3 to Form 8-K filed on November 25, 2002
4.13	Form of Camden Property Trust 5.375% Note due 2013	Exhibit 4.2 to Form 8-K filed on December 9, 2003
4.14	Form of Camden Property Trust 5.00% Note due 2015	Exhibit 4.2 to Form 8-K filed on June 7, 2005
4.15	Form of Camden Property Trust 5.700% Note due 2017	Exhibit 4.3 to Form 8-K filed on May 7, 2007
4.16	Form of Camden Property Trust 4.625% Note due 2021	Exhibit 4.4 to Form 8-K filed on May 31, 2011
4.17	Form of Camden Property Trust 4.875% Note due 2023	Exhibit 4.5 to Form 8-K filed on May 31, 2011
10.1	Form of Indemnification Agreement between Camden Property Trust and certain of its trust managers and executive officers	Form S-11 filed on July 9, 1993 (Registration No. 33-63588)

44

Exhibit No.	Description	Filed Herewith or Incorporated Herein by Reference (1)
10.2	Second Amended and Restated Employment Agreement dated July 11, 2003 between Camden Property Trust and Richard J. Campo	Exhibit 10.1 to Form 10-Q for the quarter ended June 30, 2003
10.3	Second Amended and Restated Employment Agreement dated July 11, 2003 between Camden Property Trust and D. Keith Oden	Exhibit 10.2 to Form 10-Q for the quarter ended June 30, 2003
10.4	Form of First Amendment to Second Amended and Restated Employment Agreements, effective as of January 1, 2008, between Camden Property Trust and each of Richard J. Campo and D. Keith Oden.	Exhibit 99.1 to Form 8-K filed on November 30, 2007
10.5	Second Amendment to Second Amended and Restated Employment Agreement, dated as of March 14, 2008, between Camden Property Trust and D. Keith Oden.	Exhibit 99.1 to Form 8-K filed on March 18, 2008
10.6	Form of Employment Agreement by and between Camden Property Trust and certain senior executive officers	Exhibit 10.13 to Form 10-K for the year ended December 31, 1996
10.7	Form of First Amendment to Employment Agreement, effective as of January 1, 2008, between the Company and Dennis M. Steen.	Exhibit 99.1 to Form 8-K filed on November 30, 2007
10.8	Second Amended and Restated Employment Agreement, dated November 3, 2008, between Camden Property Trust and H. Malcolm Stewart	Exhibit 99.1 to Form 8-K filed on November 4, 2008
10.9	Second Amended and Restated Camden Property Trust Key Employee Share Option Plan (KEYSOPTM), effective as of January 1, 2008	Exhibit 99.5 to Form 8-K filed on November 30, 2007
10.10	Amendment No. 1 to Second Amended and Restated Camden Property Trust Key Employee Share Option Plan, effective as of January 1, 2008	Exhibit 99.1 to Form 8-K filed on December 8, 2008
10.11	Form of Amended and Restated Master Exchange Agreement between Camden Property Trust and certain key employees	Exhibit 10.7 to Form 10-K for the year ended December 31, 2003
10.12	Form of Amended and Restated Master Exchange Agreement between Camden Property Trust and certain trust managers	Exhibit 10.8 to Form 10-K for the year ended December 31, 2003
10.13	Form of Amended and Restated Master Exchange Agreement between Camden Property Trust and certain key employees	Exhibit 10.9 to Form 10-K for the year ended December 31, 2003
10.14	Form of Master Exchange Agreement between Camden Property Trust and certain trust managers	Exhibit 10.10 to Form 10-K for the year ended December 31, 2003
10.15	Form of Amendment No. 1 to Amended and Restated Master Exchange Agreement (Trust Managers) effective November 27, 2007	Exhibit 10.1 to Form 10-Q filed on July 30, 2010
10.16	Form of Amendment No. 1 to Amended and Restated Master Exchange Agreement (Key Employees) effective November 27, 2007	Exhibit 10.2 to Form 10-Q filed on July 30, 2010

45

Exhibit No.	Description	Filed Herewith or Incorporated Herein by Reference (1)
10.17	Form of Third Amended and Restated Agreement of Limited Partnership of Camden Operating, L.P.	Exhibit 10.1 to Form S-4 filed on February 26, 1997 (Registration No. 333-22411)
10.18	First Amendment to Third Amended and Restated Agreement of Limited Partnership of Camden Operating, L.P., dated as of February 23, 1999	Exhibit 99.2 to Form 8-K filed on March 10, 1999
10.19	Form of Second Amendment to Third Amended and Restated Agreement of Limited Partnership of Camden Operating, L.P., dated as of August 13, 1999	Exhibit 10.15 to Form 10-K for the year ended December 31, 1999
10.20	Form of Third Amendment to Third Amended and Restated Agreement of Limited Partnership of Camden Operating, L.P., dated as of September 7, 1999	Exhibit 10.16 to Form 10-K for the year ended December 31, 1999
10.21	Form of Fourth Amendment to Third Amended and Restated Agreement of Limited Partnership of Camden Operating, L.P., dated as of January 7, 2000	Exhibit 10.17 to Form 10-K for the year ended December 31, 1999
10.22	Form of Amendment to Third Amended and Restated Agreement of Limited Partnership of Camden Operating, L.P., dated as of December 1, 2003	Exhibit 10.19 to Form 10-K for the year ended December 31, 2003
10.23	Amended and Restated Limited Liability Company Agreement of Sierra-Nevada Multifamily Investments, LLC, adopted as of June 29, 1998 by Camden Subsidiary, Inc. and TMT-Nevada, L.L.C.	Exhibit 99.1 to Form 8-K filed on July 15, 1998
10.24	Amended and Restated Limited Liability Company Agreement of Oasis Martinique, LLC, adopted as of October 23, 1998 among Oasis Residential, Inc. and the persons named therein	Exhibit 10.59 to Oasis Residential, Inc.’s Form 10-K for the year ended December 31, 1997 (File No. 001-12428)
10.25	Exchange Agreement, dated as of October 23, 1998, by and among Oasis Residential, Inc., Oasis Martinique, LLC and the holders listed therein	Exhibit 10.60 to Oasis Residential, Inc.’s Form 10-K for the year ended December 31, 1997 (File No. 001-12428)
10.26	Contribution Agreement, dated as of February 23, 1999, among Belcrest Realty Corporation, Belair Real Estate Corporation, Camden Operating, L.P. and Camden Property Trust	Exhibit 99.1 to Form 8-K filed on March 10, 1999
10.27	Amended and Restated 1993 Share Incentive Plan of Camden Property Trust	Exhibit 10.18 to Form 10-K for the year ended December 31, 1999
10.28	Camden Property Trust 1999 Employee Share Purchase Plan	Exhibit 10.19 to Form 10-K for the year ended December 31, 1999
10.29	Amended and Restated 2002 Share Incentive Plan of Camden Property Trust	Exhibit 10.1 to Form 10-Q for the quarter ended March 31, 2002
10.30	Amendment to Amended and Restated 2002 Share Incentive Plan of Camden Property Trust	Exhibit 99.1 to Form 8-K filed on May 4, 2006

46

Exhibit No.	Description	Filed Herewith or Incorporated Herein by Reference (1)
10.31	Amendment to Amended and Restated 2002 Share Incentive Plan of Camden Property Trust, effective as of January 1, 2008	Exhibit 99.1 to Form 8-K filed on July 29, 2008
10.32	Camden Property Trust 2011 Share Incentive Plan, effective as of May 11, 2011	Exhibit 99.1 to Form 8-K filed on May 12, 2011
10.33	Camden Property Trust Short Term Incentive Plan	Exhibit 10.2 to Form 10-Q for the quarter ended March 31, 2002
10.34	Amended and Restated Camden Property Trust Non-Qualified Deferred Compensation Plan, effective as of January 1, 2008	Exhibit 99.6 to Form 8-K filed on November 30, 2007
10.35	Amendment No. 1 to Amended and Restated Camden Property Trust Non-Qualified Deferred Compensation Plan, effective as of January 1, 2008	Exhibit 99.2 to Form 8-K filed on July 29, 2008
10.36	Amendment No. 2 to Amended and Restated Camden Property Trust Non-Qualified Deferred Compensation Plan, effective as of January 1, 2008	Exhibit 99.2 to Form 8-K filed on December 8, 2008
10.37	Form of Second Amended and Restated Agreement of Limited Partnership of Camden Summit Partnership, L.P. among Camden Summit, Inc., as general partner, and the persons whose names are set forth on Exhibit A thereto	Exhibit 10.4 to Form S-4 filed on November 24, 2004 (Registration No. 333-120733)
10.38	Form of Tax, Asset and Income Support Agreement among Camden Property Trust, Camden Summit, Inc., Camden Summit Partnership, L.P. and each of the limited partners who has executed a signature page thereto	Exhibit 10.5 to Form S-4 filed on November 24, 2004 (Registration No. 333-120733)
10.39	Employment Agreement dated February 15, 1999, by and among William B. McGuire, Jr., Summit Properties Inc. and Summit Management Company, as restated on August 24, 2001	Exhibit 10.1 to Summit Properties Inc.’s Form 10-Q for the quarter ended September 30, 2001 (File No. 000-12792)
10.40	Amendment Agreement, dated as of June 19, 2004, among William B. McGuire, Jr., Summit Properties Inc. and Summit Management Company	Exhibit 10.8.2 to Summit Properties Inc.’s Form 10-Q for the quarter ended June 30, 2004 (File No. 001-12792)
10.41	Amendment Agreement, dated as of June 19, 2004, among William F. Paulsen, Summit Properties Inc. and Summit Management Company	Exhibit 10.8.2 to Summit Properties Inc.’s Form 10-Q for the quarter ended June 30, 2004 (File No. 001-12792)
10.42	Separation Agreement, dated as of February 28, 2005, between Camden Property Trust and William B. McGuire, Jr.	Exhibit 99.1 to Form 8-K filed on April 28, 2005
10.43	Separation Agreement, dated as of February 28, 2005, between Camden Property Trust and William F. Paulsen	Exhibit 99.2 to Form 8-K filed on April 28, 2005
10.44	Distribution Agreement, dated as of April 20, 2000, by and among Camden Summit Partnership, L.P. (f/k/a Summit Properties Partnership, L.P.), Summit Properties Inc. and the Agents listed therein	Camden Summit Partnership, L.P.’s Form 8-K filed on April 28, 2000 (File No. 000-22411)

47

Exhibit No.	Description	Filed Herewith or Incorporated Herein by Reference (1)
10.45	First Amendment to Distribution Agreement, dated as of May 8, 2001, among Camden Summit Partnership, L.P. (f/k/a Summit Properties Partnership, L.P.), Summit Properties Inc. and the Agents named therein	Exhibit 10.2 to Summit Properties Inc.’s Form 10-Q for the quarter ended March 31, 2001 (File No. 000-22411)
10.46	Master Credit Agreement, dated as of September 24, 2008, among CSP Community Owner, LLC, CPT Community Owner, LLC, and Red Mortgage Capital, Inc. (2)	Exhibit 10.4 to Form 10-Q filed on July 30, 2010
10.47	Form of Master Credit Facility Agreement, dated as of April 17, 2009, among Summit Russett, LLC, 2009 CPT Community Owner, LLC, 2009 CUSA Community Owner, LLC, 2009 CSP Community Owner LLC, and 2009 COLP Community Owner, LLC, as borrowers, Camden Property Trust, as guarantor, and Red Mortgage Capital, Inc., as lender. (2)	Exhibit 10.5 to Form 10-Q filed on July 30, 2010
10.48	Distribution Agency Agreement, dated May 26, 2011, between Camden Property Trust and Merrill Lynch Pierce Fenner & Smith Incorporated	Exhibit 1.1 to the Company's Current Report on Form 8-K filed on May 27, 2011 (File No. 1-12110)
10.49	Distribution Agency Agreement, dated May 26, 2011, between Camden Property Trust and J.P. Morgan Securities LLC	Exhibit 1.2 to the Company’s Current Report on Form 8-K filed on May 27, 2011 (File No. 1-12110)
10.50	Distribution Agency Agreement, dated May 26, 2011, between Camden Property Trust and UBS Securities LLC	Exhibit 1.3 to the Company's Current Report on Form 8-K filed on May 27, 2011 (File No. 1-12110)
10.51	Distribution Agency Agreement, dated May 26, 2011, between Camden Property Trust and Morgan Keegan & Company, Inc.	Exhibit 1.4 to the Company's Current Report on Form 8-K filed on May 27, 2011 (File No. 1-12110)
10.52	Distribution Agency Agreement, dated May 26, 2011, between Camden Property Trust and Piper Jaffray & Co.	Exhibit 1.5 to the Company's Current Report on Form 8-K filed on May 27, 2011 (File No. 1-12110)
10.53	Amended and Restated Credit Agreement dated as of September 22, 2011 among Camden Property Trust, each lender from time to time party thereto, Bank of America, N.A., as Administrative Agent, Swing Line Lender and Letter of Credit Issuer, and JP Morgan Chase Bank, N.A., as Syndication Agent	Exhibit 99.1 to the Company's Current Report on Form 8-K filed on September 26, 2011 (File No. 1-12110)
12.1	Statement Regarding Computation of Ratios	Filed Herewith
21.1	List of Significant Subsidiaries	Filed Herewith
23.1	Consent of Deloitte & Touche LLP	Filed Herewith
24.1	Powers of Attorney for Richard J. Campo, D. Keith Oden, Scott S. Ingraham, Lewis A. Levey, William B. McGuire, Jr., F. Gardner Parker, William F. Paulsen, Frances Aldrich Sevilla-Secasa, Steven A. Webster, and Kelvin R. Westbrook	Filed Herewith
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act	Filed Herewith

48

Exhibit No.	Description	Filed Herewith or Incorporated Herein by Reference (1)
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act	Filed Herewith
32.1	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	Filed Herewith
101.INS	XBRL Instance Document	Filed Herewith
101.SCH	XBRL Taxonomy Extension Schema Document	Filed Herewith
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document	Filed Herewith
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document	Filed Herewith
101.LAB	XBRL Taxonomy Extension Label Linkbase Document	Filed Herewith
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document	Filed Herewith

(1) Unless otherwise indicated, all references to reports or registration statements are to reports or registration statements filed by Camden Property Trust (File No. 1-12110).

(2) Portions of the exhibit have been omitted pursuant to a request for confidential treatment.

49

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, Camden Property Trust has duly caused this Report to be signed on its behalf by the undersigned thereunto duly authorized.

February 17, 2012	CAMDEN PROPERTY TRUST
	By:	/s/ Michael P. Gallagher
		Michael P. Gallagher
		Vice President — Chief Accounting Officer

50

Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below by the following persons on behalf of Camden Property Trust and in the capacities and on the dates indicated.

Name	Title	Date
/s/ Richard J. Campo Richard J. Campo	Chairman of the Board of Trust Managers and Chief Executive Officer (Principal Executive Officer)	February 17, 2012
/s/ D. Keith Oden D. Keith Oden	President and Trust Manager	February 17, 2012
/s/ Dennis M. Steen Dennis M. Steen	Senior Vice President - Finance and Chief Financial Officer (Principal Financial Officer)	February 17, 2012
/s/ Michael P. Gallagher Michael P. Gallagher	Vice President - Chief Accounting Officer (Principal Accounting Officer)	February 17, 2012
* Scott S. Ingraham	Trust Manager	February 17, 2012
* Lewis A. Levey	Trust Manager	February 17, 2012
* William B. McGuire, Jr.	Trust Manager	February 17, 2012
* F. Gardner Parker	Trust Manager	February 17, 2012
* William F. Paulsen	Trust Manager	February 17, 2012
* Frances Aldrich Sevilla-Sacasa	Trust Manager	February 17, 2012
* Steven A. Webster	Trust Manager	February 17, 2012
* Kelvin R. Westbrook	Trust Manager	February 17, 2012
*By:   /s/ Dennis M. Steen                 Dennis M. Steen                  Attorney-in-fact

51

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Trust Managers and Shareholders of

Camden Property Trust

Houston, Texas

We have audited the accompanying consolidated balance sheets of Camden Property Trust and subsidiaries (the “Company”) as of December 31, 2011 and 2010, and the related consolidated statements of income (loss) and comprehensive income, equity and perpetual preferred units, and cash flows for each of the three years in the period ended December 31, 2011. Our audits also included the financial statement schedule listed in the Index at Item 15. These financial statements and financial statement schedule are the responsibility of the Company's management. Our responsibility is to express an opinion on the financial statements and financial statement schedule based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of Camden Property Trust and subsidiaries as of December 31, 2011 and 2010, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2011, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, such financial statement schedule, when considered in relation to the basic consolidated financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company's internal control over financial reporting as of December 31, 2011, based on the criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 17, 2012 expressed an unqualified opinion on the Company's internal control over financial reporting.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

February 17, 2012

F-1

CAMDEN PROPERTY TRUST

CONSOLIDATED BALANCE SHEETS

		September 30,			September 30,
	December 31,
(in thousands, except per share amounts)	2011			2010
Assets
Real estate assets, at cost
Land	$	768,016		$	760,397
Buildings and improvements		4,751,654			4,680,361
		5,519,670			5,440,758
Accumulated depreciation		(1,432,799	)		(1,292,924	)
Net operating real estate assets		4,086,871			4,147,834
Properties under development, including land		299,870			206,919
Investments in joint ventures		44,844			27,632
Properties held for sale		11,131			—
Total real estate assets		4,442,716			4,382,385
Accounts receivable – affiliates		31,035			31,895
Notes receivable – affiliates		—			3,194
Other assets, net		88,089			106,175
Cash and cash equivalents		55,159			170,575
Restricted cash		5,076			5,513
Total assets	$	4,622,075		$	4,699,737
Liabilities and equity
Liabilities
Notes payable
Unsecured	$	1,380,755		$	1,507,757
Secured		1,051,357			1,055,997
Accounts payable and accrued expenses		93,747			81,556
Accrued real estate taxes		21,883			22,338
Distributions payable		39,364			35,295
Other liabilities		109,276			141,496
Total liabilities		2,696,382			2,844,439
Commitments and contingencies
Perpetual preferred units		97,925			97,925
Equity
Common shares of beneficial interest; $0.01 par value per share; 100,000 shares authorized; 87,377 and 85,130 issued; 84,517 and 82,386 outstanding at December 31, 2011 and 2010, respectively		845			824
Additional paid-in capital		2,901,024			2,775,625
Distributions in excess of net income attributable to common shareholders		(690,466	)		(595,317	)
Treasury shares, at cost (12,509 and 12,766 common shares, at December 31, 2011 and 2010, respectively)		(452,003	)		(461,255	)
Accumulated other comprehensive loss		(683	)		(33,458	)
Total common equity		1,758,717			1,686,419
Noncontrolling interests		69,051			70,954
Total equity		1,827,768			1,757,373
Total liabilities and equity	$	4,622,075		$	4,699,737

See Notes to Consolidated Financial Statements.

F-2

CAMDEN PROPERTY TRUST

CONSOLIDATED STATEMENTS OF INCOME (LOSS) AND COMPREHENSIVE INCOME

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands, except per share amounts)	2011			2010			2009
Property revenues
Rental revenues	$	563,010		$	516,908		$	519,637
Other property revenues		92,858			84,542			83,011
Total property revenues		655,868			601,450			602,648
Property expenses
Property operating and maintenance		187,587			175,926			168,773
Real estate taxes		69,092			66,986			68,826
Total property expenses		256,679			242,912			237,599
Non-property income
Fee and asset management		9,973			8,172			8,008
Interest and other income		4,649			8,584			2,826
Income on deferred compensation plans		6,773			11,581			14,609
Total non-property income		21,395			28,337			25,443
Other expenses
Property management		20,686			19,982			18,864
Fee and asset management		5,935			4,841			4,878
General and administrative		35,456			30,762			31,243
Interest		112,414			125,893			128,296
Depreciation and amortization		179,867			170,362			168,845
Amortization of deferred financing costs		5,877			4,102			3,925
Expense on deferred compensation plans		6,773			11,581			14,609
Total other expenses		367,008			367,523			370,660
Loss on discontinuation of hedging relationship		(29,791	)		—			—
Gain on sale of properties, including land		4,748			236			—
Gain on sale of unconsolidated joint venture interests		1,136			—			—
Loss on early retirement of debt		—			—			(2,550	)
Impairment associated with land development activities		—			—			(85,614	)
Impairment provision on technology investment		—			(1,000	)		—
Equity in income (loss) of joint ventures		5,679			(839	)		695
Income (loss) from continuing operations before income taxes		35,348			17,749			(67,637	)
Income tax expense – current		(2,220	)		(1,581	)		(967	)
Income (loss) from continuing operations		33,128			16,168			(68,604	)
Income from discontinued operations		2,212			5,360			7,514
Gain on sale of discontinued operations, net of tax		24,621			9,614			16,887
Net income (loss)		59,961			31,142			(44,203	)
Less (income) loss allocated to noncontrolling interests from continuing operations		(3,582	)		(926	)		403
Less income allocated to perpetual preferred units		(7,000	)		(7,000	)		(7,000	)
Net income (loss) attributable to common shareholders	$	49,379		$	23,216		$	(50,800	)

See Notes to Consolidated Financial Statements.

F-3

CAMDEN PROPERTY TRUST

CONSOLIDATED STATEMENTS OF INCOME (LOSS) AND COMPREHENSIVE INCOME (Continued)

		September 30,			September 30,			September 30,
	Year Ended December 31,
(In thousands, except per share amounts)	2011			2010			2009
Earnings per share – basic
Income (loss) from continuing operations attributable to common shareholders	$	0.30		$	0.11		$	(1.19	)
Income from discontinued operations, including gain on sale, attributable to common shareholders		0.37			0.22			0.39
Net income (loss) attributable to common shareholders	$	0.67		$	0.33		$	(0.80	)
Earnings per share – diluted
Income (loss) from continuing operations attributable to common shareholders	$	0.30		$	0.11		$	(1.19	)
Income from discontinued operations, including gain on sale, attributable to common shareholders		0.36			0.22			0.39
Net income (loss) attributable to common shareholders	$	0.66		$	0.33		$	(0.80	)
Weighted average number of common shares outstanding – basic		72,756			68,608			62,359
Weighted average number of common shares outstanding – diluted		73,701			68,957			62,359
Net income (loss) attributable to common shareholders
Income (loss) from continuing operations	$	33,128		$	16,168		$	(68,604	)
Less (income) loss allocated to noncontrolling interests from continuing operations		(3,582	)		(926	)		403
Less income allocated to perpetual preferred units		(7,000	)		(7,000	)		(7,000	)
Income (loss) from continuing operations attributable to common shareholders		22,546			8,242			(75,201	)
Income from discontinued operations, including gain on sale, attributable to common shareholders		26,833			14,974			24,401
Net income (loss) attributable to common shareholders	$	49,379		$	23,216		$	(50,800	)
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$	59,961		$	31,142		$	(44,203	)
Other comprehensive income (loss)
Unrealized loss on cash flow hedging activities		(2,692	)		(19,059	)		(12,291	)
Reclassification of net losses on cash flow hedging activities		39,657			23,385			22,192
Unrealized gain on available-for-sale securities, net of tax		—			3,306			—
Reclassification of gain on available-for-sale investment to earnings, net of tax		(3,306	)		—			—
Unrealized gain (loss) and unamortized prior service cost on postretirement obligations		(884	)		65			—
Comprehensive income (loss)		92,736			38,839			(34,302	)
Less (income) loss allocated to noncontrolling interests from continuing operations		(3,582	)		(926	)		403
Less income allocated to perpetual preferred units		(7,000	)		(7,000	)		(7,000	)
Comprehensive income (loss) attributable to common shareholders	$	82,154		$	30,913		$	(40,899	)

See Notes to Consolidated Financial Statements.

F-4

CAMDEN PROPERTY TRUST

CONSOLIDATED STATEMENTS OF EQUITY AND PERPETUAL PREFERRED UNITS

		000000			000000		000000			000000			000000			000000			000000			000000			000000
	Common Shareholders
(in thousands, except per share amounts)	Common shares of beneficial interest			Additional paid-in capital		Distributions in excess of net income			Notes receivable secured by common shares			Treasury shares, at cost			Accumulated other comprehensive loss			Noncontrolling interests			Total equity			Perpetual preferred units
Equity, December 31, 2008	$	660		$	2,237,703	$	(312,309	)	$	(295	)	$	(463,209	)	$	(51,056	)	$	89,862		$	1,501,356		$	97,925
Net income (loss)							(50,800	)											(403	)		(51,203	)		7,000
Other comprehensive income																9,901						9,901
Common shares issued (10,350 shares)		104			272,008																	272,112
Net share awards		2			10,157																	10,159
Employee share purchase plan					105								1,027									1,132
Repayment of employee notes receivable, net										194												194
Common share options exercised (19 shares)					1,275																	1,275
Conversions and redemptions of operating partnership units (139 shares)		2			3,759														(3,777	)		(16	)
Common shares repurchased													(6	)								(6	)
Purchase of noncontrolling interests					647														(748	)		(101	)
Cash distributions declared to perpetual preferred units																									(7,000	)
Cash distributions declared to equity holders ($2.05 per share)							(129,462	)											(6,332	)		(135,794	)
Other		2			2																	4
Equity, December 31, 2009	$	770		$	2,525,656	$	(492,571	)	$	(101	)	$	(462,188	)	$	(41,155	)	$	78,602		$	1,609,013		$	97,925
Net income							23,216												926			24,142			7,000
Other comprehensive income																7,697						7,697
Common shares issued (4,868 shares)		49			231,602																	231,651
Net share awards		4			11,609																	11,613
Employee share purchase plan					232								933									1,165
Repayment of employee notes receivable, net										101												101
Common share options exercised (41 shares)					2,997																	2,997
Conversions and redemptions of operating partnership units (279 shares)		3			3,525														(3,553	)		(25	)
Cash distributions declared to perpetual preferred units																									(7,000	)
Cash distributions declared to equity holders ($1.80 per share)							(125,962	)											(5,046	)		(131,008	)
Other		(2	)		4														25			27
Equity, December 31, 2010	$	824		$	2,775,625	$	(595,317	)	$	—		$	(461,255	)	$	(33,458	)	$	70,954		$	1,757,373		$	97,925

See Notes to Consolidated Financial Statements.

F-5

CAMDEN PROPERTY TRUST

CONSOLIDATED STATEMENTS OF EQUITY AND PERPETUAL PREFERRED UNITS (Continued)

		000000			000000		000000			000000			000000			000000			000000			000000
	Common Shareholders
(in thousands, except per share amounts)	Common shares of beneficial interest			Additional paid-in capital		Distributions in excess of net income			Treasury shares, at cost			Accumulated other comprehensive loss			Noncontrolling interests			Total equity			Perpetual preferred units
Equity, December 31, 2010	$	824		$	2,775,625	$	(595,317	)	$	(461,255	)	$	(33,458	)	$	70,954		$	1,757,373		$	97,925
Net income							49,379									3,582			52,961			7,000
Other comprehensive income													32,775						32,775
Common shares issued (1,751 shares)		18			106,553														106,571
Net share awards		3			12,592					812									13,407
Employee share purchase plan					446					1,334									1,780
Common share options exercised (68 shares)					5,216					7,106									12,322
Conversions and redemptions of operating partnership units (66 shares)		1			591											(592	)		—
Cash distributions declared to perpetual preferred units																						(7,000	)
Cash distributions declared to equity holders ($1.96 per share)							(144,528	)								(4,893	)		(149,421	)
Other		(1	)		1
Equity, December 31, 2011	$	845		$	2,901,024	$	(690,466	)	$	(452,003	)	$	(683	)	$	69,051		$	1,827,768		$	97,925

See Notes to Consolidated Financial Statements.

F-6

CAMDEN PROPERTY TRUST

CONSOLIDATED STATEMENTS OF CASH FLOWS

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands)	2011			2010			2009
Cash flows from operating activities
Net income (loss)	$	59,961		$	31,142		$	(44,203	)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization, including discontinued operations		181,791			174,465			172,415
Gain on sale of discontinued operations, net of tax		(24,621	)		(9,614	)		(16,887	)
Gain on sale of properties, including land		(4,748	)		(236	)		—
Gain on sale of unconsolidated joint venture interests		(1,136	)		—			—
Gain on sale of available-for-sale investment		(4,301	)		—			—
Loss on discontinuation of hedging relationship		29,791			—			—
Loss on early retirement of debt		—			—			2,550
Impairment associated with land development activities		—			—			85,614
Impairment provision on technology investment		—			1,000			—
Distributions of income from joint ventures		5,329			6,524			5,664
Equity in (income) loss of joint ventures		(5,679	)		839			(695	)
Share-based compensation		12,039			11,306			9,053
Amortization of deferred financing costs		5,877			4,102			3,925
Net change in operating accounts		(9,469	)		4,508			252
Net cash from operating activities	$	244,834		$	224,036		$	217,688
Cash flows from investing activities
Development and capital improvements	$	(227,755	)	$	(63,739	)	$	(72,779	)
Proceeds from sale of joint venture interests		19,310			—			—
Proceeds from sales of properties, including land and discontinued operations		57,312			102,819			28,078
Proceeds from sale of available-for-sale investment		4,510			—			—
Decrease in notes receivable – affiliates		3,279			637			1,978
Investments in joint ventures		(46,037	)		(6,467	)		(23,159	)
Payments received on notes receivable – other		—			—			8,710
Increase in notes receivable – affiliates		(129	)		(511	)		(7,332	)
Distributions of investments from joint ventures		6,005			28			161
Other		(3,859	)		2,383			(5,173	)
Net cash from investing activities	$	(187,364	)	$	35,150		$	(69,516	)

See Notes to Consolidated Financial Statements.

F-7

CAMDEN PROPERTY TRUST

CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands)	2011			2010			2009
Cash flows from financing activities
Borrowings on unsecured line of credit	$	8,000		$	37,000		$	—
Repayments on unsecured line of credit		(8,000	)		(37,000	)		(145,000	)
Proceeds from issuance of common shares		106,571			231,651			272,112
Proceeds from notes payable		495,705			57,748			440,840
Repayment of notes payable		(627,623	)		(306,692	)		(503,705	)
Distributions to common shareholders, perpetual preferred units, and noncontrolling interests		(152,242	)		(135,626	)		(152,687	)
Payment of deferred financing costs		(9,288	)		(6,564	)		(5,124	)
Common share options exercised		11,397			1,435			620
Net decrease in accounts receivable – affiliates		860			4,217			909
Other		1,734			1,064			612
Net cash from financing activities	$	(172,886	)	$	(152,767	)	$	(91,423	)
Net increase (decrease) in cash and cash equivalents		(115,416	)		106,419			56,749
Cash and cash equivalents, beginning of year		170,575			64,156			7,407
Cash and cash equivalents, end of year	$	55,159		$	170,575		$	64,156
Supplemental information
Cash paid for interest, net of interest capitalized	$	114,615		$	128,742		$	134,266
Cash paid for income taxes		2,664			1,169			1,654
Supplemental schedule of non-cash investing and financing activities
Distributions declared but not paid	$	39,364		$	35,295		$	33,025
Value of shares issued under benefit plans, net of cancellations		18,629			14,401			6,653
Conversion of operating partnership units to common shares		592			3,536			3,753
Accrual associated with construction and capital expenditures		16,754			6,590			5,189
Conversion of mezzanine notes to joint venture equity		—			43,279			18,496
Change of fair value of available-for-sale investments, net of tax		—			3,306			—
Consolidation of joint venture at fair value, net of cash
Real estate assets		—			238,885			—
In-place leases		—			4,962			—
Other assets		—			1,135			—
Mortgage debt assumed		—			188,119			—
Other liabilities		—			3,197			—

See Notes to Consolidated Financial Statements.

F-8

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Description of Business

Business. Formed on May 25, 1993, Camden Property Trust, a Texas real estate investment trust (“REIT”), is primarily engaged in the ownership, management, development, acquisition, and construction of multifamily apartment communities. Our multifamily apartment communities are referred to as “communities,” “multifamily communities,” “properties,” or “multifamily properties” in the following discussion. As of December 31, 2011, we owned interests in, operated, or were developing 206 multifamily properties comprising 69,794 apartment homes across the United States. Of these 206 properties, ten properties were under development and when completed will consist of a total of 2,797 apartment homes. In addition, we own land parcels we may develop into multifamily apartment communities.

2. Summary of Significant Accounting Policies and Recent Accounting Pronouncements

Principles of Consolidation. Our consolidated financial statements include our accounts and the accounts of other subsidiaries and joint ventures (including partnerships and limited liability companies) over which we have control. All intercompany transactions, balances, and profits have been eliminated in consolidation. Investments acquired or created are continuously evaluated based on the accounting guidance relating to variable interest entities (“VIEs”), which requires the consolidation of VIEs in which we are considered to be the primary beneficiary. If the investment is determined not to be a VIE, then the investment is evaluated for consolidation (primarily using a voting interest model) under the remaining consolidation guidance relating to real estate entities. If we are the general partner of a limited partnership, or manager of a limited liability company, we also consider the consolidation guidance relating to the rights of limited partners (non-managing members) to assess whether any rights held by the limited partners overcome the presumption of control by us.

Allocations of Purchase Price. Upon the acquisition of real estate, we allocate the purchase price between tangible and intangible assets, which includes land, buildings, furniture and fixtures, the value of in-place leases, including above and below market leases, and acquired liabilities. When allocating the purchase price to acquired properties, we allocate costs to the estimated intangible value of in-place leases and above or below market leases and to the estimated fair value of furniture and fixtures, land, and buildings on a value determined by assuming the property was vacant by applying methods similar to those used by independent appraisers of income-producing property. Depreciation is computed on a straight-line basis over the remaining useful lives of the related tangible assets. The value of in-place leases and above or below market leases is amortized over the estimated average remaining life of leases in place at the time of acquisition. There was no unamortized value of in-place leases at December 31, 2011. The unamortized value of in-place leases at December 31, 2010 was approximately $3.9 million. Estimates of fair value of acquired debt are based upon interest rates available for the issuance of debt with similar terms and remaining maturities.

Asset Impairment. Long-lived assets are reviewed for impairment annually or whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Impairment exists if estimated future undiscounted cash flows associated with long-lived assets are not sufficient to recover the carrying value of such assets. We consider projected future discounted and undiscounted cash flows, trends, strategic decisions regarding future development plans, and other factors in our assessment of whether impairment conditions exist. When impairment exists, the long-lived asset is adjusted to its fair value. While we believe our estimates of future cash flows are reasonable, different assumptions regarding a number of factors, including market rents, economic conditions, and occupancies could significantly affect these estimates. In estimating fair value, management uses appraisals, management estimates, and discounted cash flow calculations which maximize inputs from a marketplace participant’s perspective.

In addition, we evaluate our equity investments in joint ventures and if we believe there is an other than temporary decline in market value of our investment, we will record an impairment charge.

The value of our properties under development depends on market conditions, including estimates of the project start date as well as estimates of demand for multifamily communities. We have reviewed market trends and other marketplace information and have incorporated this information as well as our current outlook into the assumptions we use in our impairment analyses. Due to the judgment and assumptions applied in the impairment analyses, it is possible actual results could differ substantially from those estimated.

F-9

We believe the carrying value of our operating real estate assets, properties under development, and land is currently recoverable. However, if market conditions deteriorate or if changes in our development strategy significantly affect any key assumptions used in our fair value calculations, we may need to take material charges in future periods for impairments related to existing assets. Any such material non-cash charges could have an adverse effect on our consolidated financial position and results of operations.

Cash and Cash Equivalents. All cash and investments in money market accounts and other highly liquid securities with a maturity of three months or less at the date of purchase are considered to be cash and cash equivalents. We maintain the majority of our cash and cash equivalents at major financial institutions in the United States and deposits with these financial institutions may exceed the amount of insurance provided on such deposits; however, we regularly monitor the financial stability of these financial institutions and believe we are not currently exposed to any significant default risk with respect to these deposits.

Cost Capitalization. Real estate assets are carried at cost plus capitalized carrying charges. Carrying charges are primarily interest and real estate taxes which are capitalized as part of properties under development. Capitalized interest is generally based on the weighted average interest rate of our unsecured debt. Transaction costs associated with the acquisition of operating real estate assets are expensed. Expenditures directly related to the development and improvement of real estate assets are capitalized at cost as land and buildings and improvements. Indirect development costs, including salaries and benefits and other related costs directly attributable to the development of properties are also capitalized. All construction and carrying costs are capitalized and reported in the balance sheet as properties under development until the apartment homes are substantially completed. Upon substantial completion of the apartment homes, the total capitalized development cost for the apartment homes and the associated land is transferred to buildings and improvements and land, respectively.

As discussed above, carrying charges are principally interest and real estate taxes capitalized as part of properties under development. Capitalized interest was approximately $8.8 million, $5.7 million, and $10.3 million for the years ended December 31, 2011, 2010, and 2009, respectively. Capitalized real estate taxes were approximately $1.4 million, $0.8 million, and $1.9 million for the years ended December 31, 2011, 2010, and 2009, respectively.

Where possible, we stage our construction to allow leasing and occupancy during the construction period, which we believe minimizes the duration of the lease-up period following completion of construction. Our accounting policy related to properties in the development and leasing phase is to expense all operating expenses associated with completed apartment homes. We capitalize renovation and improvement costs we believe extend the economic lives of depreciable property. Capital expenditures subsequent to initial construction are capitalized and depreciated over their estimated useful lives.

Depreciation and amortization is computed over the expected useful lives of depreciable property on a straight-line basis with lives generally as follows:

		September 30,
	Estimated Useful  Life
Buildings and improvements		5-35 years
Furniture, fixtures, equipment and other		3-20 years
Intangible assets (in-place leases and above and below market leases)		underlying lease term

Derivative Financial Instruments. Derivative financial instruments are recorded in the consolidated balance sheets at fair value and we do not apply master netting for financial reporting purposes. Accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows or other types of forecasted transactions are cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes attributable to the earnings effect of the hedged transactions. We may enter into derivative contracts which are intended to economically hedge certain of our risks, for which hedge accounting does not apply or we elect not to apply hedge accounting.

Discontinued Operations. A property is classified as a discontinued operation when (i) the operations and cash flows of the property can be clearly distinguished and have been or will be eliminated from our ongoing operations; (ii) the property has either been disposed of or is classified as held for sale; and (iii) we will not have any

F-10

significant continuing involvement in the operations of the property after the disposal transactions. Significant judgments are involved in determining whether a property meets the criteria for discontinued operations reporting and the period in which these criteria are met. A property is classified as held for sale when (i) management commits to a plan to sell and it is actively marketed; (ii) it is available for immediate sale in its present condition and the sale is expected to be completed within one year; and (iii) it is unlikely significant changes to the plan will be made or the plan will be withdrawn.

The results of operations for properties sold during the period or classified as held for sale at the end of the current period are classified as discontinued operations in the current and prior periods. The property-specific components of earnings classified as discontinued operations include separately identifiable property-specific revenues, expenses, depreciation, and interest expense, if any. The gain or loss resulting from the eventual disposal of the held for sale properties is also classified within discontinued operations. Real estate assets held for sale are measured at the lower of carrying amount or fair value less costs to sell and are presented separately in the accompanying consolidated balance sheets. Subsequent to classification of a property as held for sale, no further depreciation is recorded. Properties sold by our unconsolidated entities are not included in discontinued operations and related gains or losses are reported as a component of equity in income (loss) of joint ventures.

Gains on sale of real estate are recognized using the full accrual or partial sale methods, as applicable, in accordance with accounting principles generally accepted in the United States of America (“GAAP”), provided various criteria relating to the terms of sale and any subsequent involvement with the real estate sold are met.

Fair Value. For financial assets and liabilities recorded at fair value on a recurring basis, fair value is the price we would receive to sell an asset, or pay to transfer a liability, in an orderly transaction with a market participant at the measurement date. In the absence of such data, fair value is estimated using internal information consistent with what market participants would use in a hypothetical transaction.

In determining fair value, observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions; preference is given to observable inputs. These two types of inputs create the following fair value hierarchy:

• Level 1: Quoted prices for identical instruments in active markets.

• Level 2: Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.

• Level 3: Significant inputs to the valuation model are unobservable.

The following describes the valuation methodologies we use to measure different financial instruments at fair value on a recurring basis:

Deferred Compensation Plan Investments. The estimated fair values of investment securities classified as deferred compensation plan investments are based on quoted market prices utilizing public information for the same transactions. Our deferred compensation plan investments are recorded in other assets in our consolidated balance sheets.

Derivative Financial Instruments. The estimated fair values of derivative financial instruments are valued using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and volatility. The fair values of interest rate swaps and caps are estimated using the market standard methodology of netting the discounted fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of interest rates (forward curves) derived from observable market interest rate curves. In addition, credit valuation adjustments, which consider the impact of any credit enhancements to the contracts, are incorporated in the fair values to account for potential nonperformance risk, including our own nonperformance risk and the respective counterparty’s nonperformance risk. The fair value of interest rate caps is determined using the market standard methodology of discounting the future expected cash receipts which would occur if variable interest rates rise

F-11

above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observed market interest rate curves and volatilities.

Although we have determined the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default. However, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined the credit valuation adjustments are not significant to the overall valuation of our derivatives. As a result, we have determined our derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

Income Recognition. Our rental and other property revenue is recorded when due from residents and is recognized monthly as it is earned. Other property revenue consists primarily of utility rebillings and administrative, application, and other transactional fees charged to our residents. Our apartment homes are rented to residents on lease terms generally ranging from six to fifteen months, with monthly payments due in advance. All other sources of income, including interest and fee and asset management income, are recognized as earned. Eight of our properties are subject to rent control. Operations of multifamily properties acquired are recorded from the date of acquisition in accordance with the acquisition method of accounting. In management’s opinion, due to the number of residents, the types and diversity of submarkets in which our properties operate, and the collection terms, there is no significant concentration of credit risk.

Insurance. Our primary lines of insurance coverage are property, general liability, and health and workers’ compensation. We believe our insurance coverage adequately insures our properties against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood, and other perils and adequately insures us against other risks. Losses are accrued based upon our estimates of the aggregate liability for claims incurred using certain actuarial assumptions followed in the insurance industry and based on our experience.

Other Assets, Net. Other assets in our consolidated financial statements include investments under deferred compensation plans, deferred financing costs, non-real estate leasehold improvements and equipment, prepaid expenses, the value of in-place leases net of related accumulated amortization, available-for-sale investments, and other miscellaneous receivables. Investments under deferred compensation plans are classified as trading securities and are adjusted to fair market value at period end. See further discussion of our investments under deferred compensation plans in Note 11, “Share-based Compensation and Benefit Plans.” Deferred financing costs are amortized no longer than the terms of the related debt on the straight-line method, which approximates the effective interest method. Corporate leasehold improvements and equipment are depreciated using the straight-line method over the shorter of the expected useful lives or the lease terms which range from three to ten years. Our available-for-sale investments are carried at fair value with unrealized gains and losses included in accumulated other comprehensive income (loss), a separate component of shareholders’ equity.

Reportable Segments. Our multifamily communities are geographically diversified throughout the United States, and management evaluates operating performance on an individual property level. As each of our apartment communities has similar economic characteristics, residents, and products and services, our apartment communities have been aggregated into one reportable segment. Our multifamily communities generate rental revenue and other income through the leasing of apartment homes, which comprised approximately 98%, 97%, and 98% of our total property revenues and total non-property income, excluding income on deferred compensation plans for the years ended December 31, 2011, 2010, and 2009, respectively.

Restricted Cash. Restricted cash consists of escrow deposits held by lenders for property taxes, insurance and replacement reserves, cash required to be segregated for the repayment of residents’ security deposits, and escrowed amounts related to our development and acquisition activities. Substantially all restricted cash is invested in demand and short-term instruments.

Share-based Compensation. Compensation expense associated with share-based awards is recognized in our consolidated statements of income (loss) and comprehensive income using the grant-date fair values. Compensation cost for all share-based awards, including options, requires measurement at estimated fair value on the grant date and recognition of compensation expense over the requisite service period for awards expected to vest. The fair value of stock option grants is estimated using the Black-Scholes valuation model. Valuation models require the input of assumptions, including judgments to estimate the expected stock price volatility, expected life, and forfeiture rate. The compensation cost for share-based awards is based on the market value of the shares on the date of grant.

F-12

Use of Estimates. In the application of GAAP, management is required to make estimates and assumptions which affect the reported amounts of assets and liabilities at the date of the financial statements, results of operations during the reporting periods, and related disclosures. Our more significant estimates include estimates supporting our impairment analysis related to the carrying values of our real estate assets, and estimates related to the valuation of our investments in joint ventures. These estimates are based on historical experience and other assumptions believed to be reasonable under the circumstances. Future events rarely develop exactly as forecasted, and the best estimates routinely require adjustment.

Recent Accounting Pronouncements. In May 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2011-04 (“ASU 2011-04”), “Fair Value Measurement (Topic 820), Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS.” ASU 2011-04 requires entities to separately disclose the amounts and reasons for any transfers of assets and liabilities into and out of Level 1 and Level 2 of the fair value hierarchy. For fair value measurements using significant unobservable inputs (Level 3), entities will be required to disclose quantitative information about the significant unobservable inputs used for all Level 3 measurements and a description of the valuation processes in determining fair value. In addition, ASU 2011-04 requires entities to provide a qualitative discussion about the sensitivity of recurring Level 3 measurements to changes in the unobservable inputs disclosed, including the interrelationship between inputs. Entities will also be required to disclose information about when the current use of a non-financial asset measured at fair value differs from its highest and best use and the hierarchy classification for items whose fair value is not recorded on the balance sheet but is disclosed in the notes. We do not anticipate changes to our existing classification and measurement of fair value when the amended standard becomes effective on January 1, 2012; however, we do expect our disclosures will be expanded as a result.

In June 2011, the FASB issued Accounting Standards Update 2011-05 (“ASU 2011-05”), “Presentation of Comprehensive Income.” ASU 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of changes in stockholders’ equity and requires all nonowner changes in stockholders’ equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. Additionally, ASU 2011-05 requires an entity to present reclassification adjustments on the face of the financial statements from other comprehensive income to net income. ASU 2011-05 is effective for us beginning January 1, 2012. We do not expect ASU 2011-05 to have a material effect on our financial statements as we currently present other comprehensive income components in a separate but consecutive statement.

In December 2011, the FASB issued Accounting Standards Update 2011-10 (“ASU 2011-10”), “Property Plant & Equipment (Topic 360): Derecognition of In-Substance Real Estate – a Scope Clarification.” ASU 2011-10 resolves the diversity in practice about whether the guidance under FASB Accounting Standards Codification (“ASC”) Subtopic 360-20, “Property, Plant, and Equipment – Real Estate Sales,” applies to the derecognition of in substance real estate when a parent ceases to have a controlling financial interest in a subsidiary, as specified under ASC Subtopic 810-10, “Non-Controlling Interests in Consolidated Financial Statements – an amendment of ARB No. 51,” that is in substance real estate as a result of default by the subsidiary on its nonrecourse debt. The new guidance is intended to emphasize the accounting for such transactions which is based upon substance over form. ASU 2011-10 is effective for us beginning July 1, 2012 and is not expected to have a material effect on our financial statements.

In December 2011, the FASB issued Accounting Standards Update 2011-12 (“ASU 2011-12”), “Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05.” ASU 2011-12 indefinitely defers the requirements for entities to present reclassification adjustments out of accumulated other comprehensive income by component in both the statement in which net income is presented and the statement in which other comprehensive income is presented. Entities will still be required to comply with the other aspects of ASU 2011-05 as noted above. ASU 2011-12 is effective for us beginning January 1, 2012 and is not expected to have a material effect on our financial statements.

3. Share Data

Basic earnings per share are computed using net income (loss) attributable to common shareholders and the weighted average number of common shares outstanding. Diluted earnings per share reflect common shares issuable from the assumed conversion of common share options and share awards granted and units convertible into

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common shares. Only those items having a dilutive impact on our basic earnings per share are included in diluted earnings per share. Our unvested share-based awards are considered participating securities and are reflected in the calculation of basic and diluted earnings per share using the two-class method. The number of common share equivalent securities excluded from the diluted earnings per share calculation was approximately 3.8 million, 4.8 million, and 4.9 million for the years ended December 31, 2011, 2010, and 2009, respectively. These securities, which include common share options and share awards granted and units convertible into common shares, were excluded from the diluted earnings per share calculation as they are anti-dilutive.

The following table presents information necessary to calculate basic and diluted earnings per share for the periods indicated:

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands, except per share amounts)	2011			2010			2009
Earnings per share calculation – basic
Income (loss) from continuing operations attributable to common shareholders	$	22,546		$	8,242		$	(75,201	)
Amount allocated to participating securities		(551	)		(265	)		637
Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities		21,995			7,977			(74,564	)
Income from discontinued operations, including gain on sale, attributable to common shareholders		26,833			14,974			24,401
Net income (loss) attributable to common shareholders, as adjusted	$	48,828		$	22,951		$	(50,163	)
Income (loss) from continuing operations attributable to common shareholders,as adjusted – per share	$	0.30		$	0.11		$	(1.19	)
Income from discontinued operations, including gain on sale, attributable to common shareholders – per share		0.37			0.22			0.39
Net income (loss) attributable to common shareholders, as adjusted – per share	$	0.67		$	0.33		$	(0.80	)
Weighted average number of common shares outstanding – basic		72,756			68,608			62,359
Earnings per share calculation – diluted
Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities	$	21,995		$	7,977		$	(74,564	)
Income allocated to common units		45			—			—
Income (loss) from continuing operations attributable to common shareholders, as adjusted		22,040			7,977			(74,564	)
Income from discontinued operations, including gain on sale, attributable to common shareholders		26,833			14,974			24,401
Net income (loss) attributable to common shareholders, as adjusted	$	48,873		$	22,951		$	(50,163	)
Income (loss) from continuing operations attributable to common shareholders, as adjusted – per share	$	0.30		$	0.11		$	(1.19	)
Income from discontinued operations, including gain on sale, attributable to common shareholders – per share		0.36			0.22			0.39
Net income (loss) attributable to common shareholders, as adjusted – per share	$	0.66		$	0.33		$	(0.80	)
Weighted average number of common shares outstanding – basic		72,756			68,608			62,359
Incremental shares issuable from assumed conversion of:
Common share options and share awards granted		706			349			—
Common units		239			—			—
Weighted average number of common shares outstanding – diluted		73,701			68,957			62,359

4. Common Shares

In March 2010, we announced the creation of an at-the-market (“ATM”) share offering program through which we could, but had no obligation to, sell common shares having an aggregate offering price of up to $250 million (“2010 ATM program”), in amounts and at times as we determined, into the existing trading market at current market prices as well as through negotiated transactions. The 2010 ATM program has been terminated and no further common shares are available for sale under the 2010 ATM program.

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The following table presents activity under our 2010 ATM share offering program for the periods presented (in thousands, except per share amounts):

		September 30,		September 30,
	Year Ended December 31,
	2011		2010
Total net consideration	$	13,847.0	$	231,650.5
Common shares sold		252.5		4,867.7
Average price per share	$	55.81	$	48.37

In May 2011, we created a second ATM share offering program through which we can sell common shares having an aggregate offering price of up to $300 million (“2011 ATM program”) from time to time into the existing trading market at current market prices as well as through negotiated transactions. We may, but have no obligation to, sell common shares through the 2011 ATM share offering program in amounts and at times as we determine. Actual sales from time to time may depend on a variety of factors, including, among others, market conditions, the trading price of our common shares, and determination of the appropriate sources of funding for us.

The following table presents activity under our 2011 ATM program for the period presented (in thousands, except per share amounts):

		September 30,
	Year Ended December 31, 2011
Total net consideration	$	92,723.6
Common shares sold		1,498.5
Average price per share	$	62.98

During January of 2012, we sold approximately 0.1 million common shares under the 2011 ATM program at an average price of $62.41 per share for total net consideration of approximately $3.2 million. As of the date of filing, we had common shares having an aggregate offering price of up to $202.4 million remaining available for sale under the 2011 ATM program.

In January 2008, our Board of Trust Managers approved an increase of the April 2007 repurchase plan to allow for the repurchase of up to $500 million of our common equity securities through open market purchases, block purchases, and privately negotiated transactions. Under this program, we have repurchased 4.3 million shares for a total of approximately $230.2 million from April 2007 through December 31, 2011. The remaining dollar value of our common equity securities authorized to be repurchased under the program was approximately $269.8 million as of December 31, 2011. There were no repurchases of our equity securities during the years ended December 31, 2011, 2010 and 2009.

We currently have an automatic shelf registration statement on file with the Securities and Exchange Commission which allows us to offer, from time to time, an unlimited amount of common shares, preferred shares, debt securities, or warrants. Our declaration of trust provides we may issue up to 110.0 million shares of beneficial interest, consisting of 100.0 million common shares and 10.0 million preferred shares. As of December 31, 2011, we had approximately 72.0 million common shares outstanding, net of treasury shares and shares held in our deferred compensation arrangements, and no preferred shares outstanding. In January 2012, we issued 6,612,500 common shares in a public equity offering and received approximately $391.6 million in net proceeds. We utilized these proceeds to fund the acquisition of the 80% interest not owned by us in twelve related joint ventures. See Note 8 “Investments in Joint Ventures” for further discussion of this transaction.

5. Operating Partnerships

At December 31, 2011, approximately 10% of our multifamily apartment homes were held in Camden Operating, L.P (“Camden Operating” or the “operating partnership”). Camden Operating has issued both common and preferred limited partnership units. As of December 31, 2011, we held 89.8% of the common limited partnership units and the sole 1% general partnership interest of the operating partnership. The remaining common limited partnership units, comprising approximately 1.1 million units, are primarily held by former officers, directors, and investors of Paragon Group, Inc., which we acquired in 1997. Each common limited partnership unit is redeemable for one common share of Camden or cash at our election. Holders of common limited partnership units are not entitled to rights as shareholders prior to redemption of their common limited partnership units. No member of our management owns Camden Operating common limited partnership units, and one of our ten trust managers own Camden Operating common limited partnership units.

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Camden Operating has $100.0 million of 7.0% Series B Cumulative Redeemable Perpetual Preferred Units outstanding. Distributions on the preferred units are payable quarterly in arrears. The Series B preferred units were redeemable beginning in December 2008 by the operating partnership for cash at par plus the amount of any accumulated and unpaid distributions. There were no redemptions as of December 31, 2011. The preferred units are convertible beginning in 2015 by the holder into a fixed number of corresponding Series B Cumulative Redeemable Perpetual Preferred Shares of Camden. The Series B preferred units are subordinate to present and future debt. In February 2012, we redeemed the 4.0 million outstanding 7.0% Series B Cumulative Redeemable Perpetual Preferred Units at their redemption price of $25.00 per unit, or an aggregate of $100.0 million, plus accrued and unpaid distributions. In connection with this redemption, we expensed the unamortized issuance costs relating to these Series B units, which will result in a charge to earnings of approximately $2.1 million in the first quarter of 2012.

We hold the controlling managing member interest in Oasis Martinique, LLC, which owns one property in Orange County, California and is included in our consolidated financial statements. The remaining interests, comprising approximately 0.3 million units, are exchangeable into approximately 0.2 million of our common shares. In January 2012, approximately 0.2 million units were converted into approximately 0.1 million common shares.

At December 31, 2011, approximately 23% of our multifamily apartment homes were held in Camden Summit Partnership, L.P. (the “Camden Summit Partnership”). The Camden Summit Partnership has issued common limited partnership units. As of December 31, 2011, we held 94.1% of the common limited partnership units and the sole 1% general partnership interest of the Camden Summit Partnership. The remaining common limited partnership units, comprising approximately 1.1 million units, are primarily held by former officers, directors, and investors of Summit Properties Inc. (“Summit”), a company we acquired in 2005. Each common limited partnership unit is redeemable for one common share of Camden or cash at our election. Holders of common limited partnership units are not entitled to rights as shareholders prior to redemption of their common limited partnership units. No member of our management owns Camden Summit Partnership common limited partnership units, and two of our ten trust managers own Camden Summit Partnership common limited partnership units.

6. Income Taxes

We have maintained and intend to maintain our election as a REIT under the Internal Revenue Code of 1986, as amended. In order for us to continue to qualify as a REIT we must meet a number of organizational and operational requirements, including a requirement to distribute annual dividends to our shareholders equal to a minimum of 90% of our REIT taxable income, computed without regard to the dividends paid deduction and our net capital gains. As a REIT, we generally will not be subject to federal income tax on our taxable income at the corporate level to the extent such income is distributed to our shareholders annually. If our taxable income exceeds our dividends in a tax year, REIT tax rules allow us to designate dividends from the subsequent tax year in order to avoid current taxation on undistributed income. If we fail to qualify as a REIT in any taxable year, we will be subject to federal and state income taxes at regular corporate rates, including any applicable alternative minimum tax. In addition, we may not be able to requalify as a REIT for the four subsequent taxable years. We historically have incurred only state and local income, franchise, and excise taxes. Taxable income from non-REIT activities managed through taxable REIT subsidiaries is subject to applicable federal, state, and local income and margin taxes. Our operating partnerships are flow-through entities and are not subject to federal income taxes at the entity level.

We have provided for income, franchise, and margin taxes in the consolidated statements of income (loss) and comprehensive income for the years ended December 31, 2011, 2010 and 2009. Income taxes for the year ended December 31, 2011 included approximately $1.0 million associated with the gain recognized by one of our taxable REIT subsidiaries on the sale of an available-for-sale investment in February 2011. Other income tax expense is related to entity level taxes on certain ventures, state taxes, and federal taxes on certain of our taxable REIT subsidiaries. We have no significant temporary differences or tax credits associated with our taxable REIT subsidiaries.

F-16

The following table reconciles net income to REIT taxable income for the years ended December 31:

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands)	2011			2010			2009
Net income (loss)	$	59,961		$	31,142		$	(44,203	)
Less (income) loss attributable to noncontrolling interests		(3,582	)		(926	)		403
Less income allocated to perpetual preferred units		(7,000	)		(7,000	)		(7,000	)
Net income (loss) attributable to common shareholders		49,379			23,216			(50,800	)
Loss of taxable REIT subsidiaries included above		539			2,056			25,124
Net income (loss) from REIT operations		49,918			25,272			(25,676	)
Book depreciation and amortization, including discontinued operations		188,042			179,662			178,607
Tax depreciation and amortization		(155,636	)		(158,134	)		(164,639	)
Book/tax difference on gains/losses from capital transactions		(4,315	)		37,798			(7,059	)
Book/tax difference on impairment associated with land development activities		—			—			62,397
Other book/tax differences, net		8,205			(10,565	)		(24,188	)
REIT taxable income		86,214			74,033			19,442
Dividends paid deduction		(143,657	)		(124,999	)		(128,507	)
Dividends paid in excess of taxable income	$	(57,443	)	$	(50,966	)	$	(109,065	)

A schedule of per share distributions we paid and reported to our shareholders is set forth in the following table:

		September 30,			September 30,			September 30,
	Year Ended December 31,
	2011			2010			2009
Common Share Distributions
Ordinary income	$	1.08		$	0.89		$	1.74
Long-term capital gain		0.13			0.20			0.25
Unrecaptured Sec. 1250 gain		0.23			0.48			0.06
Return of capital		0.52			0.23			—
Total	$	1.96		$	1.80		$	2.05
Percentage of distributions representing tax preference items		2.83	%		3.91	%		3.94	%

We have taxable REIT subsidiaries which are subject to federal and state income taxes. At December 31, 2011, our taxable REIT subsidiaries had net operating loss carryforwards (“NOL’s”) of approximately $29.0 million which expire in years 2019 to 2031. Because NOL’s are subject to certain change of ownership, continuity of business, and separate return year limitations, and because it is unlikely the available NOL’s will be utilized or because we consider any amounts possibly utilized to be immaterial, no benefits of these NOL’s have been recognized in our consolidated financial statements.

The carrying value of net assets reported in our consolidated financial statements at December 31, 2011 exceeded the tax basis by approximately $972.8 million.

Income Tax Expense – Current. For the tax years ended December 31, 2011, 2010, and 2009, we had current income tax expense of approximately $2.2 million, $1.6 million, and $1.0 million, respectively. Income tax expense for the year ended December 31, 2011 included approximately $1.0 million associated with the gain recognized by one of our taxable REIT subsidiaries on the sale of an available-for-sale investment during 2011 and also were comprised of entity level state income taxes on certain ventures and federal income tax related to another one of our taxable REIT subsidiaries. The 2010 income tax expense was comprised mainly of entity level state income taxes on certain ventures and federal income tax related to one of our taxable REIT subsidiaries. The 2009 income tax expense was comprised mainly of state income taxes.

Income Tax Expense – Deferred. For the years ended December 31, 2011, 2010, and 2009, our deferred tax expense was not significant.

The company and its subsidiaries’ income tax returns are subject to examination by federal, state and local tax jurisdictions for years 2008 through 2010. Net income tax loss carry forwards and other tax attributes generated in years prior to 2008 are also subject to challenge in any examination of those tax years. The company and its subsidiaries are not under any notice of audit from any taxing authority at year end 2011. We believe we have no uncertain tax positions or unrecognized tax benefits requiring disclosure for the periods presented.

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7. Property Acquisitions, Discontinued Operations, Assets Held for Sale, and Impairments

Acquisitions. During 2011, we acquired 30.1 acres of land located in Atlanta, Georgia for approximately $40.1 million and 2.2 acres of land in Glendale, California for approximately $21.4 million. We intend to utilize these land holdings for development of multiple multifamily apartment communities. We did not acquire any operating properties during the year ended December 31, 2011.

In August 2010, the ownership of one of our joint ventures, which owns a multifamily property located in Irvine, California, was restructured and resulted in our ownership interest increasing from 30% to 99.99%. We previously accounted for this joint venture in accordance with the equity method of accounting. Following this restructuring, we have consolidated this entity for financial reporting purposes. At the time of this restructuring, we recorded the assets and liabilities of the joint venture at fair value, which resulted in an increase of real estate assets of approximately $92.7 million and a reduction to investments in joint ventures and notes receivable-affiliates of approximately $21.2 million and $20.7 million, respectively. We did not record a gain or loss on this restructuring as the net consideration approximated the fair market value of the net assets received. Subsequent to this restructuring, we repaid the joint venture’s existing $52.1 million secured note, which accrued interest at LIBOR plus 2.25%, and the joint venture entered into a 35 year secured credit agreement with a third-party lender in the amount of $53.0 million with an effective annual interest rate of approximately 4.35%.

In December 2010, the ownership of two of our joint ventures, which own multifamily properties located in Houston, Texas and College Park, Maryland, were restructured and resulted in our ownership interests increasing from 30% to 99.99%. We previously accounted for these joint ventures in accordance with the equity method of accounting. Following this restructuring, we have consolidated these entities for financial reporting purposes. At the time of this restructuring, we recorded the assets and liabilities of the joint ventures at fair value, which resulted in an increase of real estate assets of approximately $146.2 million and a reduction to investments in joint ventures and notes receivable-affiliates of approximately $2.4 million and $14.3 million, respectively. We did not record a gain or loss on this restructuring as the net consideration approximated the fair market value of the net assets received. Subsequent to this restructuring, we repaid one joint venture’s existing $108.8 million secured note, which accrued interest at LIBOR plus 2.0%. Additionally, we assumed the debt of one of the joint venture’s secured notes with third-party lenders for approximately $27.2 million, and repaid one of the secured notes for approximately $4.6 million. The remaining $22.6 million secured note matures in May 2019 and has an effective annual interest rate of 5.33%.

The three restructured joint ventures, discussed above, contributed revenues of approximately $2.6 million and earnings, which represent property revenues less property expenses, of approximately $1.5 million, from their respective consolidation dates through December 31, 2010. These three joint ventures contributed revenues and earnings of approximately $20.8 million and $12.6 million, respectively, during the year ended December 31, 2011.

The following unaudited pro forma summary presents consolidated information (as adjusted for discontinued operations in 2011) assuming the acquisition of control of the three joint ventures had occurred on January 1, 2009.

		September 30,		September 30,
	Pro Forma Year Ended December 31,
(in thousands)	2010		2009
	(unaudited)
Property revenues	$	618,611	$	621,101
Property operating income	$	368,264	$	375,252

Discontinued Operations and Assets Held for Sale. For the year ended December 31, 2011, income from discontinued operations included the results of operations of two operating properties, containing 788 apartment homes, sold in December 2011. For the years 2010 and 2009, income from discontinued operations also included the results of operations of two operating properties sold during 2010 and one operating property sold during 2009 through their sale dates.

For the years ended December 31, 2011, 2010 and 2009, income from discontinued operations also included the results of operations of one operating property, containing 357 apartment homes, classified as held for sale at December 31, 2011. This property was sold in January 2012 for approximately $24.5 million.

F-18

The following is a summary of income from discontinued operations for the years presented below:

		September 30,		September 30,		September 30,
	Year Ended December 31,
(in thousands)	2011		2010		2009
Property revenues	$	9,206	$	19,728	$	23,686
Property expenses		4,696		9,170		10,335
		4,510		10,558		13,351
Depreciation and amortization		2,298		5,198		5,837
Income from discontinued operations	$	2,212	$	5,360	$	7,514
Gain on sale of discontinued operations, net of tax	$	24,621	$	9,614	$	16,887

Impairment. The impairment associated with land development activities for the year ended December 31, 2009 totaled approximately $72.2 million representing the difference between the estimated fair value and the carrying value of various land holdings for development projects we either placed on hold or planned to not pursue.

Impairment for the year ended December 31, 2009 also included the write-off of $13.4 million of costs capitalized and exit costs associated with a land development joint venture we placed on hold. In the fourth quarter of 2010, this joint venture was dissolved.

During the fourth quarter of 2010, we wrote-off a $1.0 million investment associated with a technology investment which we determined was no longer recoverable.

There were no impairments for the year ended December 31, 2011.

8. Investments in Joint Ventures

As of December 31, 2011, our equity investments in unconsolidated joint ventures, which we account for utilizing the equity method of accounting, consisted of 17 joint ventures, with our ownership percentages ranging from 15% to 50%. We currently provide property management services to each of these joint ventures which own operating properties, and we may provide construction and development services to the joint ventures which own properties under development. The following table summarizes aggregate balance sheet and statement of income data for the unconsolidated joint ventures as of and for the periods presented (in millions):

	September 30,	September 30,		September 30,		September 30,
			2011		2010
Total assets			$	1,394.9	$	935.3
Total third-party debt				1,093.9		810.1
Total equity				261.6		105.3

		September 30,		September 30,	September 30,		September 30,
	2011			2010		2009
Total revenues	$	164.4		$137.6		$	137.3
Gain on sale of operating properties, net of tax		17.4		—			—
Net income (loss)		(3.2	)	(19.1)			(18.0	)
Equity in income (loss) (1)		5.7		(0.8)			0.7

(1) Equity in income (loss) of unconsolidated joint ventures excludes our ownership interest of fee income from various property management services and interest income from mezzanine loans with our joint ventures.

The joint ventures in which we have an interest have been funded in part with secured third-party debt. As of December 31, 2011, we had no outstanding guarantees related to loans of our unconsolidated joint ventures.

We may earn fees for property management, construction, development, and other services related to joint ventures in which we own an interest. Fees earned for these services, excluding third-party construction fees, amounted to approximately $9.3 million, $6.2 million, and $6.8 million for the years ended December 31, 2011, 2010, and 2009, respectively. We eliminate fee income for these services provided to these joint ventures to the extent of our ownership. Fees earned on third-party construction projects amounted to approximately $0.7 million, $2.0 million, and $1.2 million for the years ended December 31, 2011, 2010 and 2009, respectively.

F-19

During March 2011, we sold our ownership interests in three unconsolidated joint ventures for total proceeds of approximately $19.3 million and recognized a gain of approximately $1.1 million.

In April 2011, we sold one of our development properties in Washington, D.C. to one of our discretionary investment funds (the “Funds”), in which we have a 20% interest, for approximately $9.4 million and we were reimbursed for previously written-off third-party development costs, resulting in a gain of approximately $4.7 million. Additionally, in June 2011, we sold one of our development properties located in Austin, Texas to this Fund for approximately $3.1 million, resulting in a gain of approximately $0.1 million.

During the year ended December 31, 2011, the Funds also acquired eighteen multifamily properties comprised of 2,846 units located in Houston, Texas, 1,250 units located in Dallas, Texas, 768 units located in Austin, Texas, 450 units located in Tampa, Florida, 528 units located in San Antonio, Texas, and 234 units located in Atlanta, Georgia. In January 2012, one of the Funds acquired one multifamily property comprised of 350 units located in Raleigh, North Carolina.

During the fourth quarter of 2011, one of our unconsolidated joint ventures sold four operating properties consisting of 1,194 units located in Louisville, Kentucky. Our proportionate share of the gain was approximately $6.4 million, which was reported as a component of equity in income (loss) of joint ventures in the consolidated statements of income (loss) and comprehensive income.

In January 2012, we purchased the remaining 80% ownership interest in twelve unconsolidated joint ventures for approximately $99.5 million and assumed approximately $272.6 million in mortgage debt associated with these joint ventures. The purchase price and subsequent repayment of the mortgage debt was funded by proceeds received from a public equity offering as discussed in Note 4, “Common Shares.” These joint ventures are comprised of 4,034 units located in Dallas, Houston, Las Vegas, Phoenix, and Southern California. We previously accounted for these joint ventures in accordance with the equity method of accounting as of December 31, 2011. Following the completion of this transaction, we will consolidate these entities for financial reporting purposes. As of the date of this filing, the initial accounting for the purchase price allocation has not been completed as we are awaiting the completion of our analysis of the net assets acquired which we expect to be completed by the end of the first quarter 2012.

9. Notes Payable

The following is a summary of our indebtedness:

		September 30,		September 30,
	December 31,
(in millions)	2011		2010
Commercial Banks
Unsecured line of credit and short-term borrowings	$	—	$	—
Term loan, due 2012		—		500.0
	$	—	$	500.0
Senior unsecured notes
7.69% Notes, due 2011		—		88.0
5.93% Notes, due 2012		189.6		189.5
5.45% Notes, due 2013		199.7		199.6
5.08% Notes, due 2015		249.3		249.2
5.75% Notes, due 2017		246.2		246.1
4.70% Notes, due 2021		248.6		—
5.00% Notes, due 2023		247.3		—
		1,380.7		972.4
Medium-term notes
4.99% Notes, due 2011		—		35.4
Total unsecured notes payable		1,380.7		1,507.8
Secured notes
0.91% – 6.00% Conventional Mortgage Notes, due 2012 – 2045		1,012.3		1,015.7
1.59% Tax-exempt Mortgage Note, due 2028		39.1		40.3
		1,051.4		1,056.0
Total notes payable	$	2,432.1	$	2,563.8
Floating rate tax-exempt debt included in secured notes (1.59%)	$	39.1	$	40.3
Floating rate debt included in secured notes (0.91% – 1.73%)		206.4		189.9
Value of real estate assets, at cost, subject to secured notes		1,651.0		1,629.6

F-20

In September 2011, we amended our $500 million unsecured credit facility to extend the maturity date from August 2012 to September 2015 with an option to extend to September 2016. Additionally, we now have the option to increase this credit facility to $750 million by either adding additional banks to the credit facility or obtaining the agreement of existing banks to increase their commitments. The interest rate is based upon LIBOR plus a margin which is subject to change as our credit ratings change. Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates. These bid rate loans have terms of 180 days or less and may not exceed the lesser of $250 million or the remaining amount available under the line of credit. The line of credit is subject to customary financial covenants and limitations, all of which we are in compliance.

Our line of credit provides us with the ability to issue up to $100 million in letters of credit. While our issuance of letters of credit does not increase our borrowings outstanding under our line of credit, it does reduce the amount available. At December 31, 2011, we had outstanding letters of credit totaling approximately $10.4 million, leaving approximately $489.6 million available under our unsecured line of credit.

In June 2011, we issued from our existing shelf registration statement $250 million aggregate principal amount of 4.625% senior unsecured notes due June 2021 (the “2021 Notes”) and $250 million aggregate principal amount of 4.875% senior unsecured notes due June 2023 (the “2023 Notes” and, together with the 2021 Notes, the “Notes”). The 2021 Notes were offered to the public at 99.404% of their face amount with a yield to maturity of 4.70% and the 2023 Notes were offered to the public at 98.878% of their face amount with a yield to maturity of 5.00%. We received net proceeds of approximately $491.8 million, net of underwriter discounts and other offering expenses. Interest on the Notes is payable semi-annually on June 15 and December 15, beginning December 15, 2011. We may redeem each series of Notes, in whole or in part, at any time at a redemption price equal to the principal amount and accrued interest of the notes being redeemed, plus a make-whole provision. If, however, we redeem Notes of either series 90 days or fewer prior to their maturity date, the redemption price will equal 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest on the amount being redeemed to the redemption date. Each series of Notes is a direct, senior unsecured obligation and ranks equally with each other and with all of our other unsecured and unsubordinated indebtedness. We used the proceeds from this offering, together with cash on hand, to repay our outstanding $500 million term loan. In conjunction with the repayment of the $500 million term loan, we expensed approximately $0.5 million of unamortized loan costs.

As part of the 2005 Summit merger, we assumed certain debt and recorded approximately $33.9 million as a fair value adjustment which is being amortized over the respective debt terms. As of December 31, 2011, the fair value adjustment was fully amortized. We recorded amortization of the fair value adjustment, which resulted in a decrease of interest expense of approximately $0.4 million, $1.1 million, and $2.3 million during the years ended December 31, 2011, 2010, and 2009, respectively.

At December 31, 2011 and 2010, the weighted average interest rate on our floating rate debt, which includes our unsecured line of credit, was approximately 1.1% and 1.3%, respectively.

Our indebtedness, including our unsecured line of credit, had a weighted average maturity of 6.8 years at December 31, 2011. Scheduled repayments on outstanding debt, including all contractual extensions which have been exercised, including our line of credit and scheduled principal amortizations, and the weighted average interest rate on maturing debt at December 31, 2011 were as follows:

		September 30,		September 30,
(in millions)	Amount		Weighted Average Interest Rate
2012	$	294.2		5.2	%
2013		228.0		5.4
2014		11.0		6.0
2015		252.4		5.1
2016 (1)		2.6		N/A
2017 and thereafter		1,643.9		4.6
Total	$	2,432.1		4.8	%

(1) Includes only scheduled principal amortizations.

F-21

10. Derivative Financial Instruments and Hedging Activities

Risk Management Objective of Using Derivatives. We are exposed to certain risks arising from both our business operations and economic conditions. We principally manage our exposures to a wide variety of business and operational risks through management of our core business activities. We manage economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of our debt funding and the use of derivative financial instruments. Specifically, we may enter into derivative financial instruments to manage exposures arising from business activities resulting in differences in the amount, timing, and duration of our known or expected cash payments principally related to our borrowings.

Cash Flow Hedges of Interest Rate Risk. Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish these objectives, we primarily use interest rate swaps and caps as part of our interest rate risk management strategy. Interest rate swaps involve the receipt of variable rate amounts from a counterparty in exchange for us making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps involve the receipt of variable rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an upfront premium.

Designated Hedges. In August 2011, our interest rate swap, with a notional amount of $16.6 million, matured and settled. As a result of the settlement, we did not have any designated hedges as of December 31, 2011. The effective portion of changes in the fair value of derivatives designated and qualifying as cash flow hedges is recorded in accumulated other comprehensive income or loss and is subsequently reclassified into earnings in the period the hedged forecasted transaction affects earnings. During the years ending December 31, 2011 and 2010, such derivatives were used to hedge the variable cash flows associated with existing variable rate debt. The ineffective portion of the change in fair value of the derivatives, if any, is recognized directly in earnings. No portion of designated hedges was ineffective during the years ended December 31, 2011, 2010, and 2009.

Non-designated Hedges. Derivatives are not entered into for speculative purposes and are used to manage our exposure to interest rate movements and other identified risks. Our non-designated hedges are either specifically non-designated by management or do not meet strict hedge accounting requirements. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings in other income or other expense.

In connection with the repayment of the $500 million term loan on June 6, 2011, we discontinued the hedging relationship on a $500 million interest rate swap used as a cash flow hedge as of May 31, 2011. Upon repayment of the loan, which eliminated the probable future variable monthly interest payments that were being hedged, we recognized a non-cash charge of approximately $29.8 million which included the accelerated reclassification of amounts previously recorded in accumulated other comprehensive loss related to this swap. Subsequent changes in the market value of the interest rate swap, which matures in October 2012, will be recorded directly in earnings over the remaining life of the swap in interest and other income. Due to, among other matters, the relatively short remaining life of the swap (which matures in October 2012) and the low expectation of the swap becoming a significantly larger liability, management elected to leave this interest rate swap in place through its original maturity rather than cash settle the swap.

As of December 31, 2011, we had the following outstanding interest rate derivatives which were not designated as hedges of interest rate risk:

	September 30,	September 30,
Interest Rate Derivative	Number of Instruments	Notional Amount
Interest Rate Cap	1	$175.0 million
Interest Rate Swap	1	$500.0 million

F-22

The table below presents the fair value of our derivative financial instruments as well as their classification in the consolidated balance sheets at December 31 (in millions):

Septe

Septe

Septe

Septe

Septe

Septe

Septe

Septe

Septe

Fair Values of Derivative Instruments

Asset Derivatives

Liability Derivatives

2011

2010

2011

2010

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Derivatives designated as hedging instruments

Interest Rate Swaps

Other Liabilities

$

—

Other Liabilities

$

36.9

Derivatives designated not as hedging instruments

Interest Rate Swap

Other Liabilities

$

16.6

Other Liabilities

$

—

Interest Rate Cap

Other Assets

$

0.1

Other Assets

$

—

The tables below present the effect of our derivative financial instruments in the consolidated statements of income (loss) and comprehensive income for the years ended December 31 (in millions).

		septe			septe			septe		septe		septe		septe		septe	septe		septe		septe
Effect of Derivative Instruments
Derivatives in Cash Flow Hedging Relationships	Unrealized Loss Recognized in Other Comprehensive Income (“OCI”) on Derivative (Effective Portion)									Location of Loss Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)						Location of Loss Recognized in Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Loss Recognized in Statement of Income (Discontinuation, Ineffective Portion and Amount Excluded from Effectiveness Testing)
	2011			2010			2009				2011		2010		2009			2011		2010
Interest Rate Swaps (1)	$	(2.7	)	$	(19.1	)	$	(12.3	)	Interest Expense	$	9.9	$	23.4	$	22.2	Loss on discontinuation of hedging relationship	$	29.8	$	—

	September 30,		September 30,			September 30,		September 30,
Derivatives Not Designated as Hedging Instruments	Location of Income (Loss) Recognized in Statement of Income	Amount of Income (Loss) Recognized in Statement of Income
		2011			2010		2009
Interest Rate Cap	Other income/(loss)	$	(0.1	)	$	—	$	—
Interest Rate Swap	Other income/(loss)		(0.2	)		—		—

(1) The results include the interest rate swap gain (loss) prior to discontinuation in May 2011.

Credit-risk-related Contingent Features. Derivative financial investments expose us to credit risk in the event of non-performance by the counterparties under the terms of the interest rate hedge agreements. We believe we minimize our credit risk on these transactions by transacting with major creditworthy financial institutions. As part of our on-going control procedures, we monitor the credit ratings of counterparties and our exposure to any single entity, which we believe minimizes credit risk concentration.

Our agreements with each of our derivative counterparties contain provisions which provide the counterparty the right to declare a default on our derivative obligations if we are in default on any of our indebtedness, subject to certain thresholds. For all instances, these provisions include a default even if there is no acceleration of the indebtedness. Our agreements with each of our derivative counterparties also provide if we consolidate with, merge with or into, or transfer all or substantially all our assets to another entity and the creditworthiness of the resulting, surviving, or transferee entity is materially weaker than ours, the counterparty has the right to terminate the derivative obligations.

At December 31, 2011, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk (the “termination value”), related to these agreements was approximately $18.2 million. As of December 31, 2011, we had not posted any collateral related to these agreements. If we were in breach of any of these provisions at December 31, 2011, or terminated these agreements, we would have been required to settle our obligations at their aggregate termination value of approximately $18.2 million.

F-23

11. Share-based Compensation and Benefit Plans

Incentive Compensation. During the second quarter of 2011, our Board of Trust Managers adopted, and on May 11, 2011 our shareholders approved, the 2011 Share Incentive Plan of Camden Property Trust (the “2011 Share Plan”). Under the 2011 Share Plan, we may issue up to a total of approximately 9.1 million fungible units (the “Fungible Pool Limit”), which is comprised of approximately 5.8 million new fungible units plus approximately 3.3 million fungible units previously available for issuance under our 2002 share incentive plan based on a 3.45 to 1.0 fungible unit-to full value award conversion ratio. Fungible units represent the baseline for the number of shares available for issuance under the 2011 Share Plan. Different types of awards are counted differently against the Fungible Pool Limit, as follows:

• Each share issued or to be issued in connection with an award, other than an option, right or other award which does not deliver the full value at grant of the underlying shares, will be counted against the Fungible Pool Limit as 3.45 fungible pool units;

• Options and other awards which do not deliver the full value at grant of the underlying shares and which expire more than five years from date of grant will be counted against the Fungible Pool Limit as one fungible pool unit; and

• Options, rights and other awards which do not deliver the full value at date of grant and expire five years or less from the date of grant will be counted against the Fungible Pool Limit as 0.83 of a fungible pool unit.

As of December 31, 2011, approximately 9.1 million fungible units were available under the 2011 Share Plan, which results in approximately 2.6 million common shares which could be granted pursuant to full value awards based on the 3.45 to 1.0 fungible unit-to-full value award conversion ratio.

Awards which may be granted under the 2011 Share Plan include incentive share options, non-qualified share options (which may be granted separately or in connection with an option), share awards, dividends and dividend equivalents and other equity based awards. Persons eligible to receive awards under the 2011 Share Plan are trust managers, directors of our affiliates, executive and other officers, key employees and consultants, as determined by the Compensation Committee of our Board of Trust Managers. The 2011 Share Plan will expire on May 11, 2021.

Options. Options are exercisable, subject to the terms and conditions of the plan, in increments ranging from 20% to 33.33% per year on each of the anniversaries of the date of grant. The plan provides that the exercise price of an option will be determined by the Compensation Committee of the Board of Trust Managers on the day of grant, and to date all options have been granted at an exercise price that equals the fair market value on the date of grant. Options exercised during 2011 were exercised at prices ranging from $30.06 to $62.32 per option. At December 31, 2011, outstanding options and exercisable options had a weighted average remaining life of approximately 4.7 years and 3.5 years, respectively.

The total intrinsic value of options exercised was approximately $9.6 million, $1.5 million, and $0.1 million during the years ended December 31, 2011, 2010 and 2009, respectively. As of December 31, 2011, there was approximately $1.3 million of total unrecognized compensation cost related to unvested options, which is expected to be amortized over the next three years.

F-24

The following table summarizes outstanding share options and exercisable options at December 31, 2011:

		September 30,		September 30,		September 30,		September 30,
	Outstanding Options (1)				Exercisable Options (1)
Range of Exercise Prices	Number		Weighted Average Price		Number		Weighted Average Price
$30.06-$41.16		470,019	$	32.06		176,314	$	35.39
$42.90-$45.53		466,060		44.32		428,797		44.36
$48.02-$73.32		403,457		51.79		253,068		54.03
Total options		1,339,536	$	42.27		858,179	$	45.37

(1) The aggregate intrinsic value of outstanding and exercisable options at December 31, 2011 was approximately $27.0 million and $14.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $62.24 per share on December 31, 2011 and the strike price of the underlying award.

Valuation Assumptions. Options generally have a vesting period of three to five years. We estimate the fair values of each option award on the date of grant using the Black-Scholes option pricing model. No new options were granted in 2011.

The following assumptions were used for options granted during each respective period:

	September 30,		September 30,
	Year Ended December 31,
	2010	2009
Weighted average fair value of options granted	$11.69	$	3.06
Expected volatility	35.6% – 39.2%		33.0	%
Risk-free interest rate	3.6% – 3.7%		2.6	%
Expected dividend yield	4.1% – 4.4%		9.3	%
Expected life (in years)	7 – 9		7

Our computations of expected volatility for 2010 and 2009 are based on the historical volatility of our common shares over a time period equal to the expected life of the option and ending on the grant date. The interest rate for periods within the contractual life of the award is based on the U.S. Treasury yield curve in effect at the time of grant. The expected dividend yield on our common shares is estimated using the annual dividends paid in the prior year and the market price on the date of grant. Our computations of expected life for 2010 and 2009 are estimated based on historical experience of similar awards, giving consideration to the contractual terms of the share-based awards.

Share Awards and Vesting. Share awards generally have a vesting period of five years. The compensation cost for share awards is based on the market value of the shares on the date of grant and is amortized over the vesting period. To estimate forfeitures, we use actual forfeiture history. At December 31, 2011, the unamortized value of previously issued unvested share awards was approximately $27.3 million which is expected to be amortized over the next four years. The total fair value of shares vested during the years ended December 31, 2011, 2010, and 2009 was approximately $11.5 million, $10.6 million, and $10.2 million, respectively. At December 31, 2011, there were approximately 2.6 million full value share awards available for issuance.

Total compensation cost for option and share awards charged against income was approximately $12.3 million, $11.7 million, and $8.7 million for 2011, 2010, and 2009, respectively. Total capitalized compensation cost for option and share awards was approximately $0.9 million, $1.0 million, and $1.7 million for 2011, 2010 and 2009, respectively.

F-25

The following table summarizes activity under our share incentive plans for the three years ended December 31:

		September 30,			September 30,		September 30,			September 30,
	Options Outstanding			Weighted Average Exercise  / Grant Price		Nonvested Share Awards Outstanding			Weighted Average Exercise  / Grant Price
Options and nonvested share awards outstanding at December 31, 2008		1,536,527		$	44.96		520,285		$	59.40
2009 Activity:
Granted		489,509			30.06		329,018			30.11
Exercised/Vested		(18,521	)		33.45		(188,892	)		53.76
Forfeited		(24,157	)		45.08		(65,258	)		51.06
Net activity		446,831					74,868
Balance at December 31, 2009		1,983,358		$	41.39		595,153		$	46.20
2010 Activity:
Granted		55,895			43.94		372,661			40.05
Exercised/Vested		(141,213	)		32.54		(214,923	)		49.17
Forfeited		(50,904	)		46.65		(11,386	)		39.64
Net activity		(136,222	)				146,352
Balance at December 31, 2010		1,847,136		$	42.37		741,505		$	42.16
2011 Activity:
Granted		—			—		347,084			57.00
Exercised/Vested		(504,838	)		42.59		(243,874	)		47.19
Forfeited		(2,762	)		48.02		(25,961	)		44.51
Net activity		(507,600	)				77,249
Total options and nonvested share awards outstanding at December 31, 2011		1,339,536		$	42.27		818,754		$	46.88

Employee Share Purchase Plan (“ESPP”). We have established an ESPP for all active employees and officers who have completed one year of continuous service. Participants may elect to purchase our common shares through payroll deductions and/or through semi-annual contributions. At the end of each six-month offering period, each participant’s account balance is applied to acquire common shares at 85% of the market value, as defined, on the first or last day of the offering period, whichever price is lower. We currently use treasury shares to satisfy ESPP share requirements. Each participant must hold the shares purchased for nine months in order to receive the discount, and a participant may not purchase more than $25,000 in value of shares during any plan year, as defined. The following table presents information related to our ESPP:

		September 30,		September 30,		September 30,
	2011		2010		2009
Shares purchased		19,914		29,100		34,649
Weighted average fair value of shares purchased	$	63.29	$	50.70	$	35.68
Expense recorded (in millions)	$	0.3	$	0.5	$	0.4

In January 2012, approximately 4,721 shares were purchased under the ESPP related to the 2011 plan year.

Rabbi Trust. We established a rabbi trust for a select group of participants in which share awards granted under the share incentive plan and salary and other cash amounts earned may be deposited. The rabbi trust is an irrevocable trust and no portion of the trust fund may be used for any purpose other than the delivery of those assets to the participants. The assets held in the rabbi trust are subject to the claims of our general creditors in the event of bankruptcy or insolvency. The rabbi trust is in use only for deferrals made prior to 2005, including bonuses related to service in 2004 but paid in 2005.

The value of the assets of the rabbi trust is consolidated into our financial statements based on GAAP. Granted share awards held by the rabbi trust are classified in equity in a manner similar to the manner in which treasury stock is accounted. Subsequent changes in the fair value of the shares are not recognized. The deferred compensation obligation is classified as an equity instrument and changes in the fair value of the amount owed to the

F-26

participant are not recognized. At December 31, 2011 and 2010, approximately 2.0 million share awards were held in the rabbi trust. Additionally, as of December 31, 2011 and 2010, the rabbi trust held trading securities totaling approximately $45.2 million and $53.1 million, respectively, which represents cash deferrals made by plan participants. Market value fluctuations on these trading securities are recognized in income in accordance with GAAP and the liability due to participants is adjusted accordingly.

At December 31, 2011 and 2010, approximately $28.7 million and $31.4 million, respectively, was required to be paid to us by plan participants upon the withdrawal of any assets from the rabbi trust, and is included in “Accounts receivable-affiliates” in our consolidated financial statements.

Non-Qualified Deferred Compensation Plan. The Non-Qualified Deferred Compensation Plan (the “Plan”), effective December 1, 2004, is an unfunded arrangement established and maintained primarily for the benefit of a select group of participants. Eligible participants shall commence participation in the Plan on the date the deferral election first becomes effective. We will credit to the participant’s account an amount equal to the amount designated as the participant’s deferral for the plan year as indicated in the participant’s deferral election(s). Any modification to or termination of the Plan will not reduce a participant’s right to any vested amounts already credited to his or her account. At December 31, 2011 and 2010, approximately 0.9 million and 0.7 million share awards, respectively, were held in the Plan. Additionally, as of December 31, 2011 and 2010, the Plan held trading securities totaling approximately $14.5 million and $14.3 million, respectively, which represents cash deferrals made by plan participants. Market value fluctuations on these trading securities are recognized in income in accordance with GAAP and the liability due to participants is adjusted accordingly.

401(k) Savings Plan. We have a 401(k) savings plan, which is a voluntary defined contribution plan. Under the savings plan, every employee is eligible to participate, beginning on the date the employee has completed six months of continuous service with us. Each participant may make contributions to the savings plan by means of a pre-tax salary deferral, which may not be less than 1% or more than 60% of the participant’s compensation. The federal tax code limits the annual amount of salary deferrals which may be made by any participant. We may make matching contributions on the participant’s behalf up to a predetermined limit. The matching contribution made for the year ended December 31, 2011 was approximately $1.8 million, and was approximately $1.3 million for each of the years ended December 31, 2010 and 2009. A participant’s salary deferral contribution is 100% vested and nonforfeitable. A participant will become vested in our matching contributions 33% after one year of service, 67% after two years of service and 100% after three years of service. Administrative expenses under the savings plan were paid by us and were not significant for all periods presented.

12. Fair Value Measurements

The following table presents information about our financial assets and liabilities measured at fair value as of December 31, 2011 and 2010 under the fair value hierarchy discussed in Footnote 2, “Summary of Significant Accounting Policies and Recent Accounting Pronouncements”:

Assets and Liabilities Measured at Fair Value on a Recurring Basis

(in millions)

		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,
	December 31, 2011								December 31, 2010
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Deferred compensation plan investments	$	41.0	$	—	$	—	$	41.0	$	46.7	$	—	$	—	$	46.7
Available-for-sale investment		—		—		—		—		5.0		—		—		5.0
Derivative financial instruments		—		0.1		—		0.1		—		—		—		—
Liabilities
Derivative financial instruments	$	—	$	16.6	$	—	$	16.6	$	—	$	36.9	$	—	$	36.9

F-27

Other Fair Value Disclosures. As of December 31, 2011 and 2010, the carrying value of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accrued expenses and other liabilities, and distributions payable approximated fair value based on the short-term nature of these instruments.

In calculating the fair value of our notes receivable and notes payable, interest rates and spreads reflect current creditworthiness and market conditions available for the issuance of notes receivable and notes payable with similar terms and remaining maturities. The following table presents the carrying and estimated fair value of our notes receivable and notes payable for the years ended December 31:

		September 30,		September 30,		September 30,		September 30,
	December 31, 2011				December 31, 2010
(in millions)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Notes receivable – affiliates	$	—	$	—	$	3.2	$	3.2
Fixed rate notes payable (1)		2,186.6		2,304.4		2,333.5		2,386.0
Floating rate notes payable		245.5		233.6		230.3		212.7

(1) December 31, 2010 includes a $500 million term loan entered into in 2007, and a $16.6 million construction loan entered into in 2008 which are effectively fixed by the use of interest rate swaps but evaluated for estimated fair value at the floating rate. The $500 million term loan was repaid in June 2011. The $16.6 million construction loan interest rate swap matured and was not extended in conjunction with the one-year extension of the loan in July 2011.

Nonrecurring Fair Value Disclosures. Nonfinancial assets and nonfinancial liabilities measured on a nonrecurring basis utilizing level 3 inputs, primarily relate to impairment of long-lived assets or investments. There were no events during the years ended December 31, 2011 or 2010 which required fair value adjustments of our nonfinancial assets and nonfinancial liabilities.

13. Net Change in Operating Accounts

The effect of changes in the operating accounts on cash flows from operating activities is as follows:

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands)	2011			2010			2009
Change in assets:
Other assets, net	$	5,183		$	(895	)	$	10,808
Change in liabilities:
Accounts payable and accrued expenses		2,026			2,209			(10,511	)
Accrued real estate taxes		(122	)		(1,269	)		(64	)
Other liabilities		(17,152	)		4,188			(172	)
Other		596			275			191
Change in operating accounts	$	(9,469	)	$	4,508		$	252

14. Commitments and Contingencies

Construction Contracts. As of December 31, 2011, we had approximately $180.0 million of additional anticipated expenditures on our construction projects currently under development. We expect to fund these amounts through a combination of available cash balances, cash flows generated from operations, draws on our unsecured credit facility, proceeds from property dispositions, and the use of debt and equity offerings under our automatic shelf registration statement.

Litigation. One of our wholly-owned subsidiaries previously acted as a general contractor for the construction of three apartment projects in Florida which were subsequently sold and converted to condominium units by unrelated third-parties. Each condominium association of those projects has asserted claims against our subsidiary alleging, in general, defective construction as a result of alleged negligence and an alleged failure to comply with building codes. On May 25, 2011, we mediated a pre-suit settlement agreement with one of the associations to resolve its alleged claims. Pursuant to this settlement agreement, we agreed to make a one-time payment to the association which was not material.

F-28

The other two associations have filed suit against our subsidiary and other unrelated third parties in Florida claiming damages, in unspecified amounts, for the costs of repair arising out of the alleged defective construction as well as the recovery of incidental and consequential damages resulting from such alleged negligence. The remaining two lawsuits are in a very early stage and no significant discovery has been conducted. While we have denied liability to the remaining associations, it is not possible to determine the potential outcome nor is it possible to estimate a range of the amount of loss, if any, that would be associated with any potential adverse decision as these matters are in a very early stage and the pre-suit settlement mentioned above does not provide any basis for estimating losses, if any, in these two lawsuits.

We are also subject to various legal proceedings and claims which arise in the ordinary course of business. Matters which arise out of allegations of bodily injury, property damage, and employment practices are generally covered by insurance. While the resolution of these legal proceedings and claims cannot be predicted with certainty, management believes the final outcome of such matters will not have a material adverse effect on our consolidated financial statements.

Other Contingencies. In the ordinary course of our business, we issue letters of intent indicating a willingness to negotiate for acquisitions, dispositions, or joint ventures and also enter into arrangements contemplating various transactions. Such letters of intent and other arrangements are non-binding as to either party unless and until a definitive contract is entered into by the parties. Even if definitive contracts relating to the purchase or sale of real property are entered into, these contracts generally provide the purchaser with time to evaluate the property and conduct due diligence, during which periods the purchaser will have the ability to terminate the contracts without penalty or forfeiture of any deposit or earnest money. There can be no assurance definitive contracts will be entered into with respect to any matter covered by letters of intent or we will consummate any transaction contemplated by any definitive contract. Furthermore, due diligence periods for real property are frequently extended as needed. An acquisition or sale of real property becomes probable at the time the due diligence period expires and the definitive contract has not been terminated. We are then at risk under a real property acquisition contract, but generally only to the extent of any earnest money deposits associated with the contract, and are obligated to sell under a real property sales contract.

Lease Commitments. At December 31, 2011, we had long-term leases covering office facilities and equipment. Rental expense totaled approximately $2.8, $2.9, and $3.0 million for the year ended December 31, 2011, 2010 and 2009, respectively. Minimum annual rental commitments for the years ending December 31, 2012 through 2016 are approximately $2.4 million, $2.4 million, $2.2 million, $1.4 million, and $0.2 million, respectively, and approximately $0.7 million in the aggregate thereafter.

Investments in Joint Ventures. We have entered into, and may continue in the future to enter into, joint ventures or partnerships (including limited liability companies) through which we own an indirect economic interest in less than 100% of the community or land owned directly by the joint venture or partnership. Our decision whether to hold the entire interest in an apartment community or land ourselves, or to have an indirect interest in the community or land through a joint venture or partnership, is based on a variety of factors and considerations, including: (i) our projection, in some circumstances, that we will achieve higher returns on our invested capital or reduce our risk if a joint venture or partnership vehicle is used; (ii) our desire to diversify our portfolio of communities by market; (iii) our desire at times to preserve our capital resources to maintain liquidity or balance sheet strength; and (iv) the economic and tax terms required by a seller of land or of a community, who may prefer or who may require less payment if the land or community is contributed to a joint venture or partnership. Investments in joint ventures or partnerships are not limited to a specified percentage of our assets. Each joint venture or partnership agreement is individually negotiated, and our ability to operate and/or dispose of a community in our sole discretion is limited to varying degrees in our existing joint venture agreements and may be limited to varying degrees depending on the terms of future joint venture agreements.

We have discretionary investment vehicles, the Funds, to make direct and indirect investments in multifamily real estate throughout the United States, primarily through acquisitions of operating properties and certain land parcels which will be acquired by or contributed to the Funds for development. As of December 31, 2011, we had capital contributions in one of the Funds of approximately $33.0 million; and it had a combined equity capital investment of $165.0 million. At December 31, 2011, this Fund was closed for future investments. The remaining Fund will serve, until the earlier of (i) April 8, 2012, or (ii) such time as 90% of the Fund’s committed capital is invested, as the exclusive vehicle through which we will acquire fully-developed multifamily properties, subject to certain exceptions. These exceptions include properties acquired in tax-deferred transactions, follow-on investments made with respect to prior investments, significant transactions which include the issuance of our securities, significant individual asset and portfolio acquisitions, significant merger and acquisition activities,

F-29

acquisitions which are inadvisable or inappropriate for the Funds, transactions with our existing ventures, contributions or sales of properties to entities in which we remain an investor, and transactions approved by the Fund’s advisory board. The Funds will not restrict our development activities and will terminate on April 8, 2018. We are currently targeting acquisitions for the Fund where value creation opportunities are present through one or more of the following: redevelopment activities, market cycle opportunities, or improved property operations. One of our wholly-owned subsidiaries is the general partner of each of the Funds, and we have committed 20% of the total equity of the remaining open Fund, up to $37.5 million. We have received commitments to the remaining open Fund from an unaffiliated investor of $150 million and this Fund is closed to additional investors. At December 31, 2011, our capital contribution to the remaining Fund was approximately $23.7 million and it had a combined equity capital investment of $118.4 million.

Employment Agreements. At December 31, 2011, we had employment agreements with nine of our senior officers, the terms of which expire at various times through August 20, 2012. Such agreements provide for minimum salary levels, as well as various incentive compensation arrangements, which are payable based on the attainment of specific goals. The agreements also provide for severance payments plus a gross-up payment if certain situations occur, such as termination without cause or a change of control. In the case of six of the agreements, the severance payment equals one times the respective current annual base salary in the case of termination without cause and 2.99 times the respective average annual base salary over the previous three fiscal years in the case of a change of control and a termination of employment or a material adverse change in the scope of their duties. In the case of one agreement, the severance payment equals one times the respective current annual base salary for termination without cause and 2.99 times the greater of current gross income or average gross income over the previous three fiscal years in the case of a change of control. In the case of the other two agreements, the severance payment generally equals 2.99 times the respective average annual compensation over the previous three fiscal years in connection with, among other things, a termination without cause or a change of control, and the officer would be entitled to receive continuation and vesting of certain benefits in the case of such termination.

15. Postretirement Benefits

We maintain a postretirement benefit for two former officers of Summit, who also serve on our Board of Trust Managers. Benefits received by these former employees include medical benefits and office space. Participants in the postretirement plan contribute to the cost of the medical benefits. Our contribution for medical benefits was limited to amounts between $540 and $1,260 per month per participant including dependents. We contributed approximately $0.2 million for office space during the year ended December 31, 2011 and expect to contribute $0.2 million for office space in 2012. For measurement purposes, a 7.8% rate of increase in the per capita cost of covered health care claims was assumed; the rate of increase was assumed to decrease until 2027 at which point the annual rate of increase would be 4.5% and remain at that level thereafter.

As of December 31, the status of our defined postretirement benefit plan, calculated using generally accepted actuarial principles and procedures, was as follows:

		September 30,			September 30,
(in thousands)	2011			2010
Postretirement benefit obligation, beginning of year	$	2,844		$	2,949
Net periodic benefit cost		193			174
Actuarial (gain) loss		609			(65	)
Prior service cost		291			—
Amortization of prior service cost		(16	)		—
Benefits paid		(220	)		(214	)
Accumulated postretirement benefit obligation, end of year	$	3,701		$	2,844

The weighted average discount rate used to determine the value of accumulated postretirement benefit obligation for the years ended December 31, 2011 and 2010 was 4.50% and 6.10%, respectively. Postretirement liabilities are recorded in other liabilities in our consolidated balance sheets.

F-30

The following table details the components of net periodic benefit cost for the years ended December 31 related to postretirement benefits.

		September 30,		September 30,		September 30,
(in thousands)	2011		2010		2009
Interest cost	$	177	$	174	$	181
Amortization of prior service cost		16		—		—
Total net periodic benefit cost	$	193	$	174	$	181

The weighted average discount rate used to determine the value of the net periodic benefit cost for the years ended December 31, 2011, 2010 and 2009 was 5.25%, 6.10% and 6.29%, respectively.

The following table details the change in plan assets for the years ended December 31 related to postretirement benefits.

		September 30,			September 30,
(in thousands)	2011			2010
Fair value of plan assets at end of prior year	$	—		$	—
Employer contributions		220			214
Benefits paid		(220	)		(214	)
Fair value of plan assets at end of year	$	—		$	—

The following table details the amounts recognized in our accumulated other comprehensive income (loss) at December 31 related to postretirement benefits.

		September 30,			September 30,
(in thousands)	2011			2010
Accumulated other comprehensive income, beginning of year	$	201		$	136
Prior service cost arising during period		(291	)		—
Amortization of prior service cost		16			—
Net actuarial gain (loss) arising during period		(609	)		65
Accumulated other comprehensive income (loss), end of year	$	(683	)	$	201

During 2012, we expect amortization of prior service cost from other comprehensive income (loss) and recognized as benefit cost to be consistent with 2011.

The benefits expected to be paid in each of the next five fiscal years, and in the aggregate for the five fiscal years thereafter, are as follows:

		September 30,
(in thousands) Year Beginning January 1	Estimated Benefit Payment
2012	$	228
2013		233
2014		239
2015		244
2016		245
2017-2021		1,273
Total	$	2,462

The estimated benefit payments are based on assumptions about future events. Actual benefit payments may vary significantly from these estimates.

A 1% increase or decrease in assumed health care cost trend rates has no significant effect on the interest cost component of net periodic postretirement benefit costs. A 1% increase or decrease in assumed health care cost trend rates would increase or decrease the accumulated postretirement benefit obligation by approximately $0.1 million.

F-31

16. Noncontrolling Interests

The following table summarizes the effect of changes in our ownership interest in subsidiaries on the equity attributable to common shareholders for each of the years ended December 31:

		September 30,		September 30,		September 30,
	2011		2010		2009
Net income (loss) attributable to common shareholders	$	49,379	$	23,216	$	(50,800	)
Transfers from the noncontrolling interests:
Increase in equity for conversion of operating partnership units		592		3,528		3,761
Increase in equity from purchase of noncontrolling interests		—		—		647
Change in common equity and net transfers from noncontrolling interests	$	49,971	$	26,744	$	(46,392	)

17. Quarterly Financial Data (unaudited)

Summarized quarterly financial data, which has been adjusted for discontinued operations as discussed in Note 7, “Property Acquisitions, Discontinued Operations, Assets Held for Sale and Impairments,” for the years ended December 31, 2011 and 2010, is as follows:

		September 30,		September 30,			September 30,		September 30,			September 30,
(in thousands, except per share amounts)	First		Second			Third		Fourth			Total(a)
2011:
Revenues	$	158,865	$	162,750		$	166,541	$	167,712		$	655,868
Net income (loss) attributable to common shareholders		7,286		(16,597	)		11,840		46,850			49,379
Net income (loss) attributable to common shareholders per share – basic		0.10		(0.23	)(b)		0.16		0.63	(c)		0.67
Net income (loss) attributable to common shareholders per share – diluted		0.10		(0.23	)(b)		0.16		0.62	(c)		0.66
2010:
Revenues	$	147,218	$	149,049		$	152,037	$	153,146		$	601,450
Net income attributable to common shareholders		2,285		2,134			1,650		17,147			23,216
Net income attributable to common shareholders per share – basic		0.03		0.03			0.02		0.24	(d)		0.33
Net income attributable to common shareholders per share – diluted		0.03		0.03			0.02		0.24	(d)		0.33

(a) Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

(b) Includes a $29,791 loss, or $0.41 basic and diluted per share, impact related to a loss on discontinuation of a hedging relationship.

(c) Includes a $24,621, or $0.33 basic and diluted per share, impact related to the gain on sale of discontinued operations.

(d) Includes a $9,614, or $0.14 basic and $0.13 diluted per share, impact related to the gain on sale of discontinued operations.

F-32

Schedule III

Camden Property Trust

Real Estate and Accumulated Depreciation

As of December 31, 2011

(in thousands)

		00000		00000		00000		00000		00000		00000		00000		00000		00000		00000
	Initial Cost						Total Cost
	Land		Building/ Construction  in Progress & Improvements		Cost Subsequent to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Current communities:
Camden Ashburn Farm	$	4,835	$	22,604	$	730	$	4,835	$	23,334	$	28,169	$	5,079	$	23,090	$			2005
Camden Aventura		12,185		47,616		3,908		12,185		51,524		63,709		10,911		52,798		34,145		2005
Camden Ballantyne		4,503		30,250		3,020		4,503		33,270		37,773		6,998		30,775		26,025		2005
Camden Bay		7,450		63,283		5,371		7,450		68,654		76,104		22,815		53,289				1998/2002
Camden Bay Pointe		1,296		10,394		6,042		1,296		16,436		17,732		10,600		7,132				1997
Camden Bayside		3,726		28,689		13,525		3,726		42,214		45,940		23,480		22,460				1997
Camden Baytown		520		13,071		2,026		520		15,097		15,617		6,337		9,280				1999
Camden Bel Air		3,594		31,221		4,731		3,594		35,952		39,546		17,975		21,571				1998
Camden Breakers		1,055		13,024		3,802		1,055		16,826		17,881		8,395		9,486				1996
Camden Breeze		2,894		15,828		3,579		2,894		19,407		22,301		9,452		12,849				1998
Camden Brickell		14,621		57,031		3,586		14,621		60,617		75,238		13,415		61,823				2005
Camden Brookwood		7,174		31,984		1,907		7,174		33,891		41,065		7,665		33,400		22,624		2005
Camden Buckingham		2,704		21,251		2,677		2,704		23,928		26,632		10,452		16,180				1997
Camden Caley		2,047		17,445		1,577		2,047		19,022		21,069		7,385		13,684		15,352		2000
Camden Canyon		1,802		11,666		4,556		1,802		16,222		18,024		7,800		10,224				1998
Camden Cedar Hills		2,684		20,931		15		2,684		20,946		23,630		3,445		20,185				2008
Camden Centennial		3,123		13,051		2,851		3,123		15,902		19,025		7,589		11,436				1995
Camden Centre		172		1,166		255		172		1,421		1,593		733		860				1998
Camden Centreport		1,613		12,644		1,827		1,613		14,471		16,084		6,486		9,598				1997
Camden Cimarron		2,231		14,092		2,811		2,231		16,903		19,134		8,630		10,504				1997
Camden Citrus Park		1,144		6,045		3,846		1,144		9,891		11,035		6,274		4,761				1997
Camden City Centre		4,976		44,735		146		4,976		44,881		49,857		7,861		41,996		33,795		2007
Camden Clearbrook		2,384		44,017		98		2,384		44,115		46,499		7,875		38,624				2007
Camden Club		4,453		29,811		7,100		4,453		36,911		41,364		21,164		20,200				1998
Camden College Park		16,409		91,503		39		16,409		91,542		107,951		3,209		104,742				2008
Camden Commons		2,476		20,073		5,023		2,476		25,096		27,572		14,332		13,240				1998
Camden Copper Ridge		1,204		9,180		4,824		1,204		14,004		15,208		9,450		5,758				1993
Camden Copper Square		4,825		23,672		2,434		4,825		26,106		30,931		10,133		20,798				2000
Camden Cotton Mills		4,246		19,147		2,059		4,246		21,206		25,452		4,783		20,669				2005
Camden Cove		1,382		6,266		1,397		1,382		7,663		9,045		4,199		4,846				1998
Camden Creek		1,494		12,483		5,532		1,494		18,015		19,509		13,157		6,352				1993
Camden Crest		4,412		33,366		1,724		4,412		35,090		39,502		7,669		31,833				2005
Camden Crown Valley		9,381		54,210		2,006		9,381		56,216		65,597		18,672		46,925				2001
Camden Deerfield		4,895		21,922		1,248		4,895		23,170		28,065		5,359		22,706		19,220		2005
Camden Del Mar		4,404		35,264		13,123		4,404		48,387		52,791		23,180		29,611				1998
Camden Dilworth		516		16,633		129		516		16,762		17,278		3,403		13,875		13,073		2006
Camden Doral		10,260		40,416		1,109		10,260		41,525		51,785		8,877		42,908		26,825		2005
Camden Doral Villas		6,476		25,543		1,507		6,476		27,050		33,526		6,055		27,471				2005
Camden Dulles Station		10,807		61,548		111		10,807		61,659		72,466		8,169		64,297				2008
Camden Dunwoody		5,290		23,642		1,767		5,290		25,409		30,699		5,665		25,034		21,168		2005
Camden Fair Lakes		15,515		104,223		3,100		15,515		107,323		122,838		22,104		100,734				2005

S-1

    Camden Property Trust Real Estate and Accumulated Depreciation As of December 31, 2011 (in thousands) Schedule III

		0000		0000		0000		0000		0000		0000		0000		0000		0000		0000
	Initial Cost						Total Cost
	Land		Building/ Construction  in Progress & Improvements		Cost Subsequent to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Camden Fairfax Corner	$	8,484	$	72,953	$	212	$	8,484	$	73,165	$	81,649	$	14,428	$	67,221	$			2006
Camden Fairview		1,283		7,223		1,411		1,283		8,634		9,917		2,220		7,697				2005
Camden Fairways		3,969		15,543		8,621		3,969		24,164		28,133		12,909		15,224				1998
Camden Fallsgrove		9,408		43,647		923		9,408		44,570		53,978		9,508		44,470				2005
Camden Farmers Market		17,341		74,193		3,706		17,341		77,899		95,240		25,036		70,204		50,711		2001/2005
Camden Forest		970		7,209		2,521		970		9,730		10,700		5,720		4,980				1997
Camden Foxcroft		1,408		7,919		2,472		1,408		10,391		11,799		2,736		9,063		9,040		2005
Camden Gaines Ranch		5,094		37,100		2,593		5,094		39,693		44,787		8,055		36,732				2005
Camden Gardens		1,500		6,137		2,892		1,500		9,029		10,529		6,310		4,219				1994
Camden Glen Lakes		2,157		16,339		13,076		2,157		29,415		31,572		22,952		8,620				1993
Camden Governor’s Village		3,669		20,508		1,486		3,669		21,994		25,663		5,084		20,579		13,004		2005
Camden Grand Parc		7,688		35,900		669		7,688		36,569		44,257		7,715		36,542				2005
Camden Grandview		7,570		33,859		3,410		7,570		37,269		44,839		8,396		36,443				2005
Camden Greenway		16,916		43,933		4,901		16,916		48,834		65,750		20,160		45,590		52,359		1999
Camden Habersham		1,004		10,283		2,941		1,004		13,224		14,228		8,254		5,974				1997
Camden Harbor View		16,079		127,459		2,038		16,079		129,497		145,576		33,131		112,445		92,716		2003
Camden Highlands Ridge		2,612		34,726		3,813		2,612		38,539		41,151		15,216		25,935				1996
Camden Hills		853		7,834		1,351		853		9,185		10,038		4,863		5,175				1998
Camden Hunter’s Creek		4,156		20,925		1,088		4,156		22,013		26,169		5,013		21,156				2005
Camden Huntingdon		2,289		17,393		2,958		2,289		20,351		22,640		10,779		11,861				1995
Camden Interlocken		5,293		31,612		4,124		5,293		35,736		41,029		14,171		26,858		27,431		1999
Camden Lago Vista		3,497		29,623		437		3,497		30,060		33,557		7,481		26,076				2005
Camden Lake Pine		5,746		31,714		2,763		5,746		34,477		40,223		7,897		32,326		26,212		2005
Camden Lakes		3,106		22,746		10,630		3,106		33,376		36,482		22,085		14,397				1997
Camden Lakeside		1,171		7,395		4,027		1,171		11,422		12,593		7,093		5,500				1997
Camden Lakeway		3,915		34,129		4,449		3,915		38,578		42,493		16,637		25,856		29,267		1997
Camden Landings		1,045		6,434		3,786		1,045		10,220		11,265		6,649		4,616				1997
Camden Landsdowne		15,502		102,267		2,343		15,502		104,610		120,112		22,634		97,478				2005
Camden Largo Town Center		8,411		44,163		1,301		8,411		45,464		53,875		9,390		44,485				2005
Camden Las Olas		12,395		79,518		1,678		12,395		81,196		93,591		17,690		75,901				2005
Camden Laurel Ridge		915		4,338		2,436		915		6,774		7,689		4,510		3,179				1994
Camden Lee Vista		4,350		34,643		3,463		4,350		38,106		42,456		13,881		28,575				2000
Camden Legacy		4,068		26,612		4,423		4,068		31,035		35,103		14,713		20,390				1998
Camden Legacy Creek		2,052		12,896		2,267		2,052		15,163		17,215		7,117		10,098				1997
Camden Legacy Park		2,560		15,449		2,840		2,560		18,289		20,849		8,281		12,568		13,866		1997
Camden Legends		1,370		6,382		917		1,370		7,299		8,669		3,507		5,162				1998
Camden Live Oaks		6,428		39,127		13,373		6,428		52,500		58,928		26,984		31,944				1998
Camden Main & Jamboree		17,363		75,387		20		17,363		75,407		92,770		3,602		89,168		52,130		2008
Camden Manor Park		2,535		47,159		349		2,535		47,508		50,043		10,225		39,818		29,675		2006
Camden Martinique		28,401		51,861		10,747		28,401		62,608		91,009		26,928		64,081		39,061		1998
Camden Midtown		4,583		18,026		3,273		4,583		21,299		25,882		8,776		17,106		28,058		1999
Camden Midtown Atlanta		6,196		33,828		2,107		6,196		35,935		42,131		8,335		33,796		20,565		2005
Camden Miramar		—		31,655		6,430		—		38,085		38,085		13,906		24,179				1994-2011
Camden Monument Place		9,030		54,089		47		9,030		54,136		63,166		9,101		54,065				2007

S-2

    Camden Property Trust Real Estate and Accumulated Depreciation As of December 31, 2011 (in thousands) Schedule III

		00000		00000		00000		00000		00000		00000		00000		00000		00000		00000
	Initial Cost						Total Cost
	Land		Building/ Construction  in Progress & Improvements		Cost Subsequent to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Camden Oak Crest	$	2,078	$	20,941	$	1,051	$	2,078	$	21,992	$	24,070	$	7,061	$	17,009	$	17,309		2003
Camden Old Creek		20,360		71,777		203		20,360		71,980		92,340		12,622		79,718				2007
Camden Orange Court		5,319		40,733		63		5,319		40,796		46,115		5,907		40,208				2008
Camden Overlook		4,591		25,563		2,606		4,591		28,169		32,760		6,707		26,053		19,546		2005
Camden Palisades		8,406		31,497		7,080		8,406		38,577		46,983		18,074		28,909				1998
Camden Park Commons		1,146		11,311		1,916		1,146		13,227		14,373		6,351		8,022				1997
Camden Peachtree City		6,536		29,063		1,637		6,536		30,700		37,236		7,203		30,033				2005
Camden Pinehurst		3,380		14,807		6,568		3,380		21,375		24,755		19,715		5,040				1997
Camden Pinnacle		1,640		12,287		2,508		1,640		14,795		16,435		7,195		9,240				1994
Camden Plantation		6,299		77,964		4,270		6,299		82,234		88,533		17,357		71,176				2005
Camden Plaza		7,204		31,044		95		7,204		31,139		38,343		1,170		37,173		22,214		2007
Camden Pointe		2,058		14,879		2,274		2,058		17,153		19,211		7,836		11,375				1998
Camden Portofino		9,867		38,702		2,300		9,867		41,002		50,869		8,701		42,168				2005
Camden Potomac Yard		16,498		88,317		51		16,498		88,368		104,866		13,075		91,791				2008
Camden Preserve		1,206		17,982		2,536		1,206		20,518		21,724		8,411		13,313				1997
Camden Providence Lakes		2,020		14,855		4,723		2,020		19,578		21,598		6,740		14,858				2002
Camden Renaissance		4,144		39,987		3,763		4,144		43,750		47,894		16,949		30,945				1997
Camden Reserve		3,910		20,027		7,438		3,910		27,465		31,375		15,300		16,075				1997
Camden Reunion Park		3,302		18,457		1,661		3,302		20,118		23,420		4,680		18,740		19,961		2005
Camden Ridgecrest		1,008		12,720		2,528		1,008		15,248		16,256		7,970		8,286				1995
Camden River		5,386		24,025		2,863		5,386		26,888		32,274		6,344		25,930		21,614		2005
Camden Roosevelt		11,470		45,785		481		11,470		46,266		57,736		10,103		47,633				2005
Camden Royal Oaks		1,055		20,046		160		1,055		20,206		21,261		4,780		16,481				2006
Camden Royal Palms		2,147		38,339		788		2,147		39,127		41,274		6,065		35,209				2007
Camden Russett		13,460		61,837		2,101		13,460		63,938		77,398		13,632		63,766		45,063		2005
Camden San Paloma		6,480		23,045		3,139		6,480		26,184		32,664		8,237		24,427				2002
Camden Sea Palms		4,336		9,930		2,157		4,336		12,087		16,423		5,679		10,744				1998
Camden Sedgebrook		5,266		29,211		2,049		5,266		31,260		36,526		6,930		29,596		21,306		2005
Camden Shiloh		4,181		18,798		1,089		4,181		19,887		24,068		4,817		19,251		10,576		2005
Camden Sierra at Otay		10,585		49,781		1,436		10,585		51,217		61,802		13,779		48,023				2003
Camden Silo Creek		9,707		45,144		734		9,707		45,878		55,585		9,716		45,869				2005
Camden Simsbury		1,152		6,499		994		1,152		7,493		8,645		1,607		7,038				2005
Camden South End Square		6,625		29,175		1,438		6,625		30,613		37,238		6,913		30,325				2005
Camden Springs		1,520		8,300		3,791		1,520		12,091		13,611		9,444		4,167				1994
Camden St. Clair		7,526		27,486		2,252		7,526		29,738		37,264		6,567		30,697		21,646		2005
Camden Steeplechase		1,089		5,190		4,621		1,089		9,811		10,900		7,431		3,469				1994
Camden Stockbridge		5,071		22,693		1,183		5,071		23,876		28,947		5,746		23,201		14,332		2005
Camden Stonebridge		1,016		7,137		2,527		1,016		9,664		10,680		5,582		5,098				1993
Camden Stonecrest		3,954		22,021		2,117		3,954		24,138		28,092		5,289		22,803		16,920		2005
Camden Stoneleigh		3,498		31,285		1,670		3,498		32,955		36,453		6,276		30,177				2006
Camden Summerfield		14,659		48,404		141		14,659		48,545		63,204		7,486		55,718				2008
Camden Sweetwater		4,395		19,664		1,381		4,395		21,045		25,440		5,054		20,386				2005
Camden Touchstone		1,203		6,772		1,928		1,203		8,700		9,903		2,411		7,492				2005
Camden Travis Street		1,780		29,104		44		1,780		29,148		30,928		2,852		28,076		31,476		2010

S-3

    Camden Property Trust Real Estate and Accumulated Depreciation As of December 31, 2011 (in thousands) Schedule III

		00000		00000		00000		00000		00000		00000		00000		00000		00000		00000
	Initial Cost						Total Cost
	Land		Building/ Construction  in Progress & Improvements		Cost Subsequent to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Camden Tuscany	$	3,330	$	36,466	$	698	$	3,330	$	37,164	$	40,494	$	9,859	$	30,635	$			2003
Camden Valley Park		3,096		14,667		11,947		3,096		26,614		29,710		19,016		10,694				1994
Camden Valleybrook		7,340		39,139		1,322		7,340		40,461		47,801		9,010		38,791				2005
Camden Vanderbilt		16,076		44,918		12,642		16,076		57,560		73,636		28,224		45,412		73,165		1994/1997
Camden Vineyards		4,367		28,494		1,085		4,367		29,579		33,946		8,965		24,981				2002
Camden Vintage		3,641		19,255		4,334		3,641		23,589		27,230		12,328		14,902				1998
Camden Westshore		1,734		10,819		5,869		1,734		16,688		18,422		9,845		8,577				1997
Camden Westview		1,031		7,932		4,172		1,031		12,104		13,135		8,224		4,911				1993
Camden Westwood		4,567		25,519		1,417		4,567		26,936		31,503		6,042		25,461		19,907		2005
Camden Whispering Oaks		1,188		26,242		70		1,188		26,312		27,500		4,162		23,338				2008
Camden Woods		2,693		19,930		8,012		2,693		27,942		30,635		16,448		14,187				1999
Camden World Gateway		5,785		51,821		1,598		5,785		53,419		59,204		10,856		48,348				2005
Total Current communities(1):		754,941		4,270,862		427,951		754,941		4,698,813		5,453,754		1,432,053		4,021,701		1,051,357

(1) Current communities may include costs included in properties under development on the balance sheet as of December 31, 2011.

S-4

    Camden Property Trust Real Estate and Accumulated Depreciation As of December 31, 2011 (in thousands) Schedule III

		00000		00000		00000		00000		00000		00000		00000		00000		00000		00000
	Initial Cost						Total Cost
	Land		Building/ Construction in Progress & Improvements		Cost Subsequent  to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Lease-up & Construction communities:
Camden LaVina	$	12,907	$	41,852	$	—	$	12,907	$	41,852	$	54,759	$	511	$	54,248	$			N/A
Camden Summerfield II		4,459		19,840		—		4,459		19,840		24,299		150		24,149				N/A
Total Lease-up construction communities (2):		17,366		61,692		—		17,366		61,692		79,058		661		78,397		—
Communities under construction:
Camden City Centre II				10,148		—				10,148		10,148		—		10,148				N/A
Camden Montague				13,364		—				13,364		13,364		2		13,362				N/A
Camden NOMA				39,022		—				39,022		39,022		2		39,020				N/A
Camden Royal Oaks II				11,085		—				11,085		11,085		13		11,072				N/A
Camden Town Square				28,653		—				28,653		28,653		—		28,653				N/A
Camden Westchase Park				29,590		—				29,590		29,590		1		29,589				N/A
Total Construction communities (2):		—		131,862		—		—		131,862		131,862		18		131,844		—
Total Development Pipeline and Land Holdings (2)		—		151,576		—		—		151,576		151,576		67		151,509		—		N/A
Corporate		—		3,290		—		—		3,290		3,290		—		3,290		—		N/A
	$	17,366	$	348,420		—		17,366	$	348,420	$	365,786	$	746	$	365,040		—
TOTAL	$	772,307	$	4,619,282	$	427,951	$	772,307	$	5,047,233	$	5,819,540	$	1,432,799	$	4,386,741	$	1,051,357

(2) Lease-up/development communities may include costs included under buildings and improvements on the balance sheet as of December 31, 2011.

S-5

    Camden Property Trust Real Estate and Accumulated Depreciation As of December 31, 2011 (in thousands) Schedule III

The changes in total real estate assets for the years ended December 31:

		September 30,			September 30,			September 30,
	2011			2010			2009
Balance, beginning of period	$	5,647,677		$	5,461,626		$	5,455,834
Additions during period:
Acquisition		—			238,885			—
Development		180,028			21,798			36,495
Improvements		61,037			44,405			35,377
Classification from held for sale		—			—			9,518
Deductions during period:
Cost of real estate sold contributed to joint venture		(12,578	)		(119,037	)		(3,345	)
Cost of real estate sold – other		(32,673	)		—			—
Impairment		—			—			(72,253	)
Classification to held for sale		(23,951	)		—			—
Balance, end of period	$	5,819,540		$	5,647,677		$	5,461,626
The changes in accumulated depreciation for the years ended December 31:
	2011			2010			2009
Balance, Beginning of period	$	1,292,924		$	1,149,056		$	981,049
Depreciation		171,009			166,867			170,480
Real Estate sold		(18,877	)		(22,999	)		(2,473	)
Transferred to held for sale		(12,257	)		—			—
Balance, end of period	$	1,432,799		$	1,292,924		$	1,149,056

The aggregate cost for federal income tax purposes at December 31, 2011 was $5.0 billion.

S-6

EX-12.1

EXHIBIT 12.1

CAMDEN PROPERTY TRUST

STATEMENT REGARDING COMPUTATION OF RATIOS

FOR THE FIVE YEARS ENDED DECEMBER 31

		September 30,		September 30,			September 30,			September 30,			September 30,
(in thousands, except for ratio amounts)	2011 (1)		2010 (2)			2009 (3)			2008 (4)			2007 (5)
EARNINGS BEFORE FIXED CHARGES:
Income (loss) from continuing operations before income taxes	$	35,348	$	17,749		$	(67,637	)	$	(8,445	)	$	50,261
Less: Equity in income (loss) of joint ventures		5,679		(839	)		695			(1,265	)		1,526
		29,669		18,588			(68,332	)`		(7,180	)		48,735
Add: Distributed income of joint ventures		5,329		6,524			5,664			5,392			5,406
Less: Interest capitalized		8,764		5,687			10,298			17,718			22,622
Less: Preferred distribution of subsidiaries		7,000		7,000			7,000			7,000			7,000
Total earnings before fixed charges		19,234		12,425			(79,966	)		(26,506	)		24,519
FIXED CHARGES:
Interest expense		112,414		125,893			128,296			132,399			115,753
Interest capitalized		8,764		5,687			10,298			17,718			22,622
Accretion of discount		650		514			628			571			590
Loan amortization		5,877		4,102			3,925			2,958			3,661
Interest portion of rental expense		167		174			940			928			912
Preferred distribution of subsidiaries		7,000		7,000			7,000			7,000			7,000
Total fixed charges		134,872		143,370			151,087			161,574			150,538
Total earnings and fixed charges	$	154,106	$	155,795		$	71,121		$	135,068		$	175,057
RATIO OF EARNINGS TO FIXED CHARGES		1.14		1.09			0.47			0.84			1.16

(1) Earnings include a $29,791 loss impact related to a loss on discontinuation of a hedging relationship, a $1,136 impact related to gain on sale of joint venture interests, a $6,394 gain on sale of unconsolidated joint venture properties, a $3,316 impact related to a net gain on the sale of an available-for-sale investment, and a $4,748 impact related to gains on the sale of properties, including land. Excluding these impacts, the ratio would be 1.25.

(2) Earnings include a $1,000 impact related to an impairment provision on technology investment and a $236 impact related to a gain on the sale of land. These transactions did not have an impact on the ratio of 1.09.

(3) We would have needed to generate an additional $79,966 to achieve a coverage of one to one in 2009. Earnings include an $85,614, impact related to impairment associated with land development activities and a $2,550 impact related to loss on early retirement of debt. Excluding these impacts, the ratio would be 1.05.

(4) We would have needed to generate an additional $26,506 to achieve a coverage of one to one in 2008. Earnings include a $51,323 impact related to impairment associated with land development activities, a $13,566 impact related to gain on early retirement of debt, and a $2,929 impact related to gain on sale of properties, including land. Excluding these impacts, the ratio would be 1.05.

(5) Earnings include a $1,447 impact related to impairment associated with land development activities. Excluding this impact, the ratio would be 1.17.

		September 30,			September 30,			September 30,			September 30,			September 30,
INTEREST COVERAGE RATIO
Total revenues	$	677,263		$	629,787		$	628,091		$	583,392		$	593,062
Total expenses		(623,687	)		(610,435	)		(608,259	)		(555,744	)		(542,880	)
Income from discontinued operations		2,212			5,360			7,514			11,115			19,455
Add: Depreciation and amortization		185,744			174,464			172,770			168,963			155,248
Add: Depreciation of discontinued operations		2,298			5,198			5,837			8,571			12,665
Add: Interest expense		112,414			125,893			128,296			132,399			115,753
Add: Interest expense of discontinued operations		—			—			—			466			998
Total	$	356,244		$	330,267		$	334,249		$	349,162		$	354,301
Total interest expense	$	112,414		$	125,893		$	128,296		$	132,865		$	116,751
INTEREST COVERAGE RATIO		3.2			2.6			2.6			2.6			3.0

EX-21.1

EXHIBIT 21.1

Names of Significant Subsidiaries	State of Incorporation/ Organization	Name Under Which Business is Done
1. Camden Operating, L.P.	Delaware	Camden Operating, L.P.
2. Camden USA, Inc.	Delaware	Camden USA, Inc.
3. Camden Development, Inc.	Delaware	Camden Development, Inc.
4. Camden Realty, Inc.	Delaware	Camden Realty, Inc.
5. Camden Summit, Inc.	Delaware	Camden Summit, Inc.
6. Camden Summit Partnership, L.P.	Delaware	Camden Summit Partnership, L.P.
7. CPT Community Owner, LLC	Delaware	CPT Community Owner, LLC
8. 2009 CPT Community Owner, LLC	Delaware	2009 CPT Community Owner, LLC

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following registration statements on Form S-8:

No. 33-80230

No. 333-32569

No. 333-57565

No. 333-99185

Post-Effective Amendment No. 1 to No. 333-99185

No. 333-62570

No. 333-174154

and the following registration statements on Form S-3:

Amendment No. 1 to No. 33-84536

No. 333-25637

Amendment No. 4 to No. 333-70295

Amendment No. 1 to No. 333-92959

No. 333-103119

Amendment No. 1 to No. 333-123612

No. 333-126046

No. 333-135195

No. 333-159372

No. 333-177864

of our reports dated February 17, 2012, relating to the consolidated financial statements and financial statement schedule of Camden Property Trust, and the effectiveness of Camden Property Trust’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Camden Property Trust for the year ended December 31, 2011.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

February 17, 2012

EX-24.1

Exhibit 24.1

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint D. Keith Oden and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ Richard J. Campo

Signature

Richard J. Campo

Print Name

Dated: February 17, 2012

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint Richard J. Campo and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ D. Keith Oden

Signature

D. Keith Oden

Print Name

Dated: February 17, 2012

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint D. Keith Oden, Richard J. Campo and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ Scott S. Ingraham

Signature

Scott S. Ingraham

Print Name

Dated: February 17, 2012

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint D. Keith Oden, Richard J. Campo and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ Lewis A. Levey

Signature

Lewis A. Levey

Print Name

Dated: February 17, 2012

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint D. Keith Oden, Richard J. Campo and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ William B. McGuire, Jr.

Signature

William B. McGuire, Jr.

Print Name

Dated: February 17, 2012

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint D. Keith Oden, Richard J. Campo and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ F. Gardner Parker

Signature

F. Gardner Parker

Print Name

Dated: February 17, 2012

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint D. Keith Oden, Richard J. Campo and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ William F. Paulsen

Signature

William F. Paulsen                                         

Print Name

Dated: February 17, 2012

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint D. Keith Oden, Richard J. Campo and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ Frances Aldrich Sevilla-Sacasa

Signature

Frances Aldrich Sevilla-Sacasa

Print Name

Dated: February 17, 2012

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint D. Keith Oden, Richard J. Campo and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ Steven A. Webster

Signature

Steven A. Webster

Print Name

Dated: February 17, 2012

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned does hereby constitute and appoint D. Keith Oden, Richard J. Campo and Dennis M. Steen, and each of them, each with full power to act without the other, his true and lawful attorneys-in-fact and agents, each with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign an Annual Report (the “Annual Report”) of CAMDEN PROPERTY TRUST on Form 10-K for the year ended December 31, 2011 and to sign any and all amendments to the Annual Report and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents or any of them may lawfully do or cause to be done by virtue hereof.

/s/ Kelvin R. Westbrook

Signature

Kelvin R. Westbrook

Print Name

Dated: February 17, 2012

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Richard J. Campo, certify that:

1. I have reviewed this annual report on Form 10-K of Camden Property Trust;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 17, 2012	/s/Richard J. Campo
	Richard J. Campo
	Chairman of the Board of Trust Managers and
	Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Dennis M. Steen, certify that:

1. I have reviewed this annual report on Form 10-K of Camden Property Trust;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: February 17, 2012	/s/ Dennis M. Steen
	Dennis M. Steen
	Senior Vice President-Finance and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned, Richard J. Campo, Chairman of the Board and Chief Executive Officer of Camden Property Trust (the “Company”), and Dennis M. Steen, the Senior Vice President-Finance and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:

1. The Annual Report on Form 10-K of the Company for the year ended December 31, 2011 (“the Report”) fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Annual Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Richard J. Campo

Richard J. Campo

Chairman of the Board of Trust Managers and

Chief Executive Officer

/s/ Dennis M. Steen

Dennis M. Steen

Senior Vice President-Finance and

Chief Financial Officer

February 17, 2012

XML

Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Data [Abstract]

Quarterly Financial Data

17. Quarterly Financial Data (unaudited)

Summarized quarterly financial data, which has been adjusted for discontinued operations as discussed in Note 7, "Property Acquisitions, Discontinued Operations, Assets Held for Sale and Impairments," for the years ended December 31, 2011 and 2010, is as follows:

		September 30,		September 30,			September 30,		September 30,			September 30,
(in thousands, except per share amounts)	First		Second			Third		Fourth			Total(a)
2011:
Revenues	$	158,865	$	162,750		$	166,541	$	167,712		$	655,868
Net income (loss) attributable to common shareholders		7,286		(16,597	)		11,840		46,850			49,379
Net income (loss) attributable to common shareholders per share – basic		0.10		(0.23	)(b)		0.16		0.63	(c)		0.67
Net income (loss) attributable to common shareholders per share – diluted		0.10		(0.23	)(b)		0.16		0.62	(c)		0.66
2010:
Revenues	$	147,218	$	149,049		$	152,037	$	153,146		$	601,450
Net income attributable to common shareholders		2,285		2,134			1,650		17,147			23,216
Net income attributable to common shareholders per share – basic		0.03		0.03			0.02		0.24	(d)		0.33
Net income attributable to common shareholders per share – diluted		0.03		0.03			0.02		0.24	(d)		0.33

(a) Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

(b) Includes a $29,791 loss, or $0.41 basic and diluted per share, impact related to a loss on discontinuation of a hedging relationship.

(c) Includes a $24,621, or $0.33 basic and diluted per share, impact related to the gain on sale of discontinued operations.

(d) Includes a $9,614, or $0.14 basic and $0.13 diluted per share, impact related to the gain on sale of discontinued operations.

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Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Investments In Joint Ventures [Abstract]
Total assets	$ 1,394,900,000		$ 935,300,000
Total third-party debt	1,093,900,000		810,100,000
Total equity	261,600,000		105,300,000
Total revenues	164,400,000		137,600,000		137,300,000
Gain on sale of operating properties, net of tax	17,400,000
Net income (loss)	(3,200,000)		(19,100,000)		(18,000,000)
Equity in income (loss)	$ 5,679,000	[1]	$ (839,000)	[1]	$ 695,000	[1]

[1] Equity in income (loss) of unconsolidated joint ventures excludes our ownership interest of fee income from various property management services and interest income from mezzanine loans with our joint ventures.

XML

Income Taxes (Reconciliation of Net Income To REIT Taxable Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Income Taxes [Abstract]
Net income (loss)									$ 59,961		$ 31,142		$ (44,203)
Less (income) loss attributable to noncontrolling interests									(3,582)		(926)		403
Less income allocated to perpetual preferred units									(7,000)		(7,000)		(7,000)
Net income (loss) attributable to common shareholders	46,850	11,840	(16,597)	7,286	17,147	1,650	2,134	2,285	49,379	[1]	23,216	[1]	(50,800)
Loss of taxable REIT subsidiaries included above									539		2,056		25,124
Net income (loss) from REIT operations									49,918		25,272		(25,676)
Book depreciation and amortization, including discontinued operations									188,042		179,662		178,607
Tax depreciation and amortization									(155,636)		(158,134)		(164,639)
Book/tax difference on gains/losses from capital transactions									(4,315)		37,798		(7,059)
Book/tax difference on impairment associated with land development activities													62,397
Other book/tax differences, net									8,205		(10,565)		(24,188)
REIT taxable income									86,214		74,033		19,442
Dividends paid deduction									(143,657)		(124,999)		(128,507)
Dividends paid in excess of taxable income									$ (57,443)		$ (50,966)		$ (109,065)

[1] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

XML

Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Anticipated expenditures relating to completion of construction type contracts	$ 180.0
Rental expense	2.8	2.9	3.0
Minimum annual rental commitments, 2012	2.4
Minimum annual rental commitments, 2013	2.4
Minimum annual rental commitments, 2014	2.2
Minimum annual rental commitments, 2015	1.4
Minimum annual rental commitments, 2016	0.2
Minimum annual rental commitments, thereafter	0.7
Fund investment period	earlier of (i) April 8, 2012, or (ii) such time as 90% of the Fund's committed capital is invested, as the exclusive vehicle through which we will acquire fully-developed multifamily properties, subject to certain exceptions.
Equity method investment, ownership percentage	20.00%
Number of senior officers under employment agreements	9
Number of apartment projects with asserted claims during reporting period	3
Number of associations which have filed suit against our subsidiary	2
Percentage Of Invested Capital	90.00%
Maximum [Member]
Equity method investment, ownership percentage	50.00%
Aggregate equity funds	37.5
Funds from unaffiliated investor	150
Maximum [Member] | Partnership Interest [Member]
Less than joint venture economic interest noted	100.00%
Six Agreements [Member]
Employee severance compensation under employment agreement	the severance payment equals one times the respective current annual base salary in the case of termination without cause and 2.99 times the respective average annual base salary over the previous three fiscal years in the case of a change of control and a termination of employment or a material adverse change in the scope of their duties.
One Agreement [Member]
Employee severance compensation under employment agreement	severance payment equals one times the respective current annual base salary for termination without cause and 2.99 times the greater of current gross income or average gross income over the previous three fiscal years in the case of a change of control.
Two Agreements [Member]
Employee severance compensation under employment agreement	severance payment generally equals 2.99 times the respective average annual compensation over the previous three fiscal years in connection with, among other things, a termination without cause or a change of control, and the officer would be entitled to receive continuation and vesting of certain benefits in the case of such termination.
Fund Open For Future Investment [Member]
Capital contribution	23.7
Total capital contributions	118.4
Fund Closed For Future Investment [Member]
Capital contribution	33.0
Total capital contributions	$ 165.0

XML

Notes Payable (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended		3 Months Ended
	Jun. 30, 2011	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009	Sep. 30, 2011 Line Of Credit [Member]	Dec. 31, 2011 Line Of Credit [Member]	Dec. 31, 2011 Letter Of Credit [Member]	Jun. 30, 2011 4.625% Notes Due 2021 [Member]	Dec. 31, 2011 4.625% Notes Due 2021 [Member]	Jun. 30, 2011 4.875 Notes Due 2023 [Member]	Dec. 31, 2011 4.875 Notes Due 2023 [Member]	Sep. 30, 2011 Line Of Credit [Member]	Dec. 31, 2011 Line Of Credit [Member]	Jun. 30, 2011 Commercial Banks [Member] Term Loan, Due 2012 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 4.625% Notes Due 2021 [Member]	Dec. 31, 2011 Senior Unsecured Notes [Member] 4.70% Notes Due 2021 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 4.875 Notes Due 2023 [Member]	Dec. 31, 2011 Senior Unsecured Notes [Member] 5.00% Notes Due 2023 [Member]	Dec. 31, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member]	Dec. 31, 2011 Medium-Term Notes [Member] 4.99% Notes Due 2011 [Member]	Dec. 31, 2011 Floating Rate Debt [Member]	Dec. 31, 2010 Floating Rate Debt [Member]
Debt Instrument [Line Items]
Amount of current borrowing capacity under unsecured credit facility					$ 500
Prior maturity period of unsecured credit facility					August 2012
Current maturity period of unsecured credit facility												September 2015
Optional extension period of unsecured credit facility												September 2016
Maximum term of bid rate loans (days)						180
Lesser of amount stated or the amount available under the line of credit						250
Maximum borrowing capacity under unsecured credit facility							100						750
Outstanding letters of credit under credit facility							10.4
Available amount under unsecured credit facility						489.6
Repayment of senior unsecured notes		500												500
Interest rate of notes payable								4.625%		4.875%
Yield to maturity interest rate on notes payable								4.70%		5.00%
Yield to maturity interest rate on notes payable																4.70%		5.00%	7.69%	4.99%
Aggregate principal face amount of senior unsecured notes															250		250
Net proceeds from notes payable	491.8
Notes payable, maturity date								Jun. 01, 2021		Jun. 01, 2023
Discount on notes payable face amount									99.404%		98.878%
Fair value adjustment of assumed debt		33.9
Threshold period for redemption of notes (days)		90
Redemption price as percentage of principal plus accrued and unpaid interest if redeemed at or prior to threshold period		100.00%
Decrease of interest expense as a result of amortization of fair value adjustment		0.4	1.1	2.3
Write off of unamortized loan costs														$ 0.5
Weighted average interest rate on floating rate debt		4.80%																			1.10%	1.30%
Weighted average maturity of indebtedness (including unsecured line of credit) (in years)		6.8

XML

Quarterly Financial Data (Summarized Quarterly Financial Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011		Mar. 31, 2011	Dec. 31, 2010		Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Quarterly Financial Data [Abstract]
Revenues	$ 167,712		$ 166,541	$ 162,750		$ 158,865	$ 153,146		$ 152,037	$ 149,049	$ 147,218	$ 655,868	[1]	$ 601,450	[1]	$ 602,648
Net income (loss) attributable to common shareholders	46,850		11,840	(16,597)		7,286	17,147		1,650	2,134	2,285	49,379	[1]	23,216	[1]	(50,800)
Net income (loss) attributable to common shareholders, as adjusted - per share	$ 0.63	[2]	$ 0.16	$ (0.23)	[3]	$ 0.10	$ 0.24	[4]	$ 0.02	$ 0.03	$ 0.03	$ 0.67	[1]	$ 0.33	[1]	$ (0.80)
Net income (loss) attributable to common shareholders, as adjusted - per share	$ 0.62	[2]	$ 0.16	$ (0.23)	[3]	$ 0.10	$ 0.24	[4]	$ 0.02	$ 0.03	$ 0.03	$ 0.66	[1]	$ 0.33	[1]	$ (0.80)
Loss on discontinuation of hedging relationship												(29,791)
Loss on discontinuation of a hedging relationship per share, basic				$ 0.41
Loss from discontinuation of a hedging relationship per diluted share during the quarter				$ 0.41
Gain on sale of discontinued operations	$ 24,621						$ 9,614					$ 24,621		$ 9,614		$ 16,887
Gain on sale of discontinued operations per share, basic	$ 0.33						$ 0.14
Gain on sale of discontinued operations per share, diluted	$ 0.33						$ 0.13

[1] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

[2] Includes a $24,621, or $0.33 basic and diluted per share, impact related to the gain on sale of discontinued operations.

[3] Includes a $29,791 loss, or $0.41 basic and diluted per share, impact related to a loss on discontinuation of a hedging relationship.

[4] Includes a $9,614, or $0.14 basic and $0.13 diluted per share, impact related to the gain on sale of discontinued operations.

XML

Operating Partnerships (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended	1 Months Ended		12 Months Ended	1 Months Ended
	Dec. 31, 2011 Camden Operating LP [Member]	Jan. 31, 2012 Oasis Martinique LLC [Member]	Dec. 31, 2011 Oasis Martinique LLC [Member]	Dec. 31, 2011 Camden Summit Partnership LP [Member]	Feb. 17, 2012 Redemption of Units [Member]	Feb. 17, 2012 Redemption of Units [Member] Camden Operating LP [Member]
Operating Partnerships [Line Items]
Percentage of real estate properties held with operating partnership	10.00%			23.00%
Common and preferred limited partnership interest	89.80%			94.10%
General partnership interest	1.00%			1.00%
Limited partnership units	1,100,000		300,000	1,100,000
Converted shares		100,000
Cumulative redeemable perpetual preferred units, value	$ 100.0
Cumulative redeemable perpetual preferred units, dividend rate	7.00%				7.00%
Temporary equity, shares outstanding						4,000,000
Preferred Stock, Redemption Price Per Share					$ 25.00
Aggregate redemption price					100.0
Series B issuance costs					$ 2.1
Resultant number of common shares from exchange of operating interest units			200,000
Units Converted To Shares During Period		200,000

XML

Derivative Instruments And Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2011

Derivative [Line Items]

Fair Value Of Derivative Financial Instruments And Their Classification In The Balance Sheet

September 30,

September 30,

September 30,

September 30,

September 30,

September 30,

September 30,

September 30,

September 30,

Fair Values of Derivative Instruments

Asset Derivatives

Liability Derivatives

2011

2010

2011

2010

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Derivatives designated as hedging instruments

Interest Rate Swaps

Other Liabilities

$

—

Other Liabilities

$

36.9

Derivatives designated not as hedging instruments

Interest Rate Swap

Other Liabilities

$

16.6

Other Liabilities

$

—

Interest Rate Cap

Other Assets

$

0.1

Other Assets

$

—

Effect Of Derivative Financial Instruments On The Statements Of Income And Comprehensive Income

Effect of Derivative Instruments
Derivatives in Cash Flow Hedging Relationships	Unrealized Loss Recognized in Other Comprehensive Income ("OCI") on Derivative (Effective Portion)									Location of Loss Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)						Location of Loss Recognized in Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Loss Recognized in Statement of Income (Discontinuation, Ineffective Portion and Amount Excluded from Effectiveness Testing)
	2011			2010			2009				2011		2010		2009			2011		2010
Interest Rate Swaps (1)	$	(2.7	)	$	(19.1	)	$	(12.3	)	Interest Expense	$	9.9	$	23.4	$	22.2	Loss on discontinuation of hedging relationship	$	29.8	$	—

	September 30,		September 30,			September 30,		September 30,
Derivatives Not Designated as Hedging Instruments	Location of Income (Loss) Recognized in Statement of Income	Amount of Income (Loss) Recognized in Statement of Income
		2011			2010		2009
Interest Rate Cap	Other income/(loss)	$	(0.1	)	$	—	$	—
Interest Rate Swap	Other income/(loss)		(0.2	)		—		—

(1) The results include the interest rate swap gain (loss) prior to discontinuation in May 2011.

Not-Designated [Member]

Derivative [Line Items]

Schedule Of Outstanding Interest Rate Derivatives

	September 30,	September 30,
Interest Rate Derivative	Number of Instruments	Notional Amount
Interest Rate Cap	1	$175.0 million
Interest Rate Swap	1	$500.0 million

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Schedule III - Real Estate And Accumulated Depreciation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 772,307
Building/Construction in Progress & Improvements, Initial Cost	4,619,282
Cost Subsequent to Acquisition/Construction	427,951
Land, Total Cost	772,307
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	5,047,233
Total Cost	5,819,540
Accumulated Depreciation	1,432,799
Total Cost, Net of Accumulated Depreciation	4,386,741
Encumbrances	1,051,357
Lease-Up Development Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	17,366
Building/Construction in Progress & Improvements, Initial Cost	61,692
Land, Total Cost	17,366
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	61,692
Total Cost	79,058
Accumulated Depreciation	661
Total Cost, Net of Accumulated Depreciation	78,397
Development Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	151,576	[1]
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	151,576	[1]
Total Cost	151,576	[1]
Accumulated Depreciation	67	[1]
Total Cost, Net of Accumulated Depreciation	151,509	[1]
Year of Completion/Acquisition	N/A	[1]
Current Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	754,941
Building/Construction in Progress & Improvements, Initial Cost	4,270,862
Cost Subsequent to Acquisition/Construction	427,951
Land, Total Cost	754,941
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	4,698,813
Total Cost	5,453,754
Accumulated Depreciation	1,432,053
Total Cost, Net of Accumulated Depreciation	4,021,701
Encumbrances	1,051,357
Corporate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	3,290
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	3,290
Total Cost	3,290
Total Cost, Net of Accumulated Depreciation	3,290
Year of Completion/Acquisition	N/A
Total Construction Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	131,862
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	131,862
Total Cost	131,862
Accumulated Depreciation	18
Total Cost, Net of Accumulated Depreciation	131,844
Construction Community Sub-Total [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	17,366
Building/Construction in Progress & Improvements, Initial Cost	348,420
Land, Total Cost	17,366
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	348,420
Total Cost	365,786
Accumulated Depreciation	746
Total Cost, Net of Accumulated Depreciation	365,040
Camden Ashburn Farm [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,835
Building/Construction in Progress & Improvements, Initial Cost	22,604
Cost Subsequent to Acquisition/Construction	730
Land, Total Cost	4,835
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	23,334
Total Cost	28,169
Accumulated Depreciation	5,079
Total Cost, Net of Accumulated Depreciation	23,090
Year of Completion/Acquisition	2005
Camden Aventura [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	12,185
Building/Construction in Progress & Improvements, Initial Cost	47,616
Cost Subsequent to Acquisition/Construction	3,908
Land, Total Cost	12,185
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	51,524
Total Cost	63,709
Accumulated Depreciation	10,911
Total Cost, Net of Accumulated Depreciation	52,798
Encumbrances	34,145
Year of Completion/Acquisition	2005
Camden Ballantyne [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,503
Building/Construction in Progress & Improvements, Initial Cost	30,250
Cost Subsequent to Acquisition/Construction	3,020
Land, Total Cost	4,503
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	33,270
Total Cost	37,773
Accumulated Depreciation	6,998
Total Cost, Net of Accumulated Depreciation	30,775
Encumbrances	26,025
Year of Completion/Acquisition	2005
Camden Bay [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	7,450
Building/Construction in Progress & Improvements, Initial Cost	63,283
Cost Subsequent to Acquisition/Construction	5,371
Land, Total Cost	7,450
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	68,654
Total Cost	76,104
Accumulated Depreciation	22,815
Total Cost, Net of Accumulated Depreciation	53,289
Year of Completion/Acquisition	1998/2002
Camden Bay Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,296
Building/Construction in Progress & Improvements, Initial Cost	10,394
Cost Subsequent to Acquisition/Construction	6,042
Land, Total Cost	1,296
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	16,436
Total Cost	17,732
Accumulated Depreciation	10,600
Total Cost, Net of Accumulated Depreciation	7,132
Year of Completion/Acquisition	1997
Camden Bayside [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,726
Building/Construction in Progress & Improvements, Initial Cost	28,689
Cost Subsequent to Acquisition/Construction	13,525
Land, Total Cost	3,726
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	42,214
Total Cost	45,940
Accumulated Depreciation	23,480
Total Cost, Net of Accumulated Depreciation	22,460
Year of Completion/Acquisition	1997
Camden Baytown [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	520
Building/Construction in Progress & Improvements, Initial Cost	13,071
Cost Subsequent to Acquisition/Construction	2,026
Land, Total Cost	520
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	15,097
Total Cost	15,617
Accumulated Depreciation	6,337
Total Cost, Net of Accumulated Depreciation	9,280
Year of Completion/Acquisition	1999
Camden Bel Air [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,594
Building/Construction in Progress & Improvements, Initial Cost	31,221
Cost Subsequent to Acquisition/Construction	4,731
Land, Total Cost	3,594
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	35,952
Total Cost	39,546
Accumulated Depreciation	17,975
Total Cost, Net of Accumulated Depreciation	21,571
Year of Completion/Acquisition	1998
Camden Breakers [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,055
Building/Construction in Progress & Improvements, Initial Cost	13,024
Cost Subsequent to Acquisition/Construction	3,802
Land, Total Cost	1,055
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	16,826
Total Cost	17,881
Accumulated Depreciation	8,395
Total Cost, Net of Accumulated Depreciation	9,486
Year of Completion/Acquisition	1996
Camden Breeze [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,894
Building/Construction in Progress & Improvements, Initial Cost	15,828
Cost Subsequent to Acquisition/Construction	3,579
Land, Total Cost	2,894
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	19,407
Total Cost	22,301
Accumulated Depreciation	9,452
Total Cost, Net of Accumulated Depreciation	12,849
Year of Completion/Acquisition	1998
Camden Brickell [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	14,621
Building/Construction in Progress & Improvements, Initial Cost	57,031
Cost Subsequent to Acquisition/Construction	3,586
Land, Total Cost	14,621
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	60,617
Total Cost	75,238
Accumulated Depreciation	13,415
Total Cost, Net of Accumulated Depreciation	61,823
Year of Completion/Acquisition	2005
Camden Brookwood [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	7,174
Building/Construction in Progress & Improvements, Initial Cost	31,984
Cost Subsequent to Acquisition/Construction	1,907
Land, Total Cost	7,174
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	33,891
Total Cost	41,065
Accumulated Depreciation	7,665
Total Cost, Net of Accumulated Depreciation	33,400
Encumbrances	22,624
Year of Completion/Acquisition	2005
Camden Buckingham [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,704
Building/Construction in Progress & Improvements, Initial Cost	21,251
Cost Subsequent to Acquisition/Construction	2,677
Land, Total Cost	2,704
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	23,928
Total Cost	26,632
Accumulated Depreciation	10,452
Total Cost, Net of Accumulated Depreciation	16,180
Year of Completion/Acquisition	1997
Camden Caley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,047
Building/Construction in Progress & Improvements, Initial Cost	17,445
Cost Subsequent to Acquisition/Construction	1,577
Land, Total Cost	2,047
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	19,022
Total Cost	21,069
Accumulated Depreciation	7,385
Total Cost, Net of Accumulated Depreciation	13,684
Encumbrances	15,352
Year of Completion/Acquisition	2000
Camden Canyon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,802
Building/Construction in Progress & Improvements, Initial Cost	11,666
Cost Subsequent to Acquisition/Construction	4,556
Land, Total Cost	1,802
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	16,222
Total Cost	18,024
Accumulated Depreciation	7,800
Total Cost, Net of Accumulated Depreciation	10,224
Year of Completion/Acquisition	1998
Camden Cedar Hills [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,684
Building/Construction in Progress & Improvements, Initial Cost	20,931
Cost Subsequent to Acquisition/Construction	15
Land, Total Cost	2,684
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	20,946
Total Cost	23,630
Accumulated Depreciation	3,445
Total Cost, Net of Accumulated Depreciation	20,185
Year of Completion/Acquisition	2008
Camden Centennial [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,123
Building/Construction in Progress & Improvements, Initial Cost	13,051
Cost Subsequent to Acquisition/Construction	2,851
Land, Total Cost	3,123
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	15,902
Total Cost	19,025
Accumulated Depreciation	7,589
Total Cost, Net of Accumulated Depreciation	11,436
Year of Completion/Acquisition	1995
Camden Centre [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	172
Building/Construction in Progress & Improvements, Initial Cost	1,166
Cost Subsequent to Acquisition/Construction	255
Land, Total Cost	172
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	1,421
Total Cost	1,593
Accumulated Depreciation	733
Total Cost, Net of Accumulated Depreciation	860
Year of Completion/Acquisition	1998
Camden Centreport [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,613
Building/Construction in Progress & Improvements, Initial Cost	12,644
Cost Subsequent to Acquisition/Construction	1,827
Land, Total Cost	1,613
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	14,471
Total Cost	16,084
Accumulated Depreciation	6,486
Total Cost, Net of Accumulated Depreciation	9,598
Year of Completion/Acquisition	1997
Camden Cimarron [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,231
Building/Construction in Progress & Improvements, Initial Cost	14,092
Cost Subsequent to Acquisition/Construction	2,811
Land, Total Cost	2,231
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	16,903
Total Cost	19,134
Accumulated Depreciation	8,630
Total Cost, Net of Accumulated Depreciation	10,504
Year of Completion/Acquisition	1997
Camden Citrus Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,144
Building/Construction in Progress & Improvements, Initial Cost	6,045
Cost Subsequent to Acquisition/Construction	3,846
Land, Total Cost	1,144
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	9,891
Total Cost	11,035
Accumulated Depreciation	6,274
Total Cost, Net of Accumulated Depreciation	4,761
Year of Completion/Acquisition	1997
Camden City Centre [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,976
Building/Construction in Progress & Improvements, Initial Cost	44,735
Cost Subsequent to Acquisition/Construction	146
Land, Total Cost	4,976
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	44,881
Total Cost	49,857
Accumulated Depreciation	7,861
Total Cost, Net of Accumulated Depreciation	41,996
Encumbrances	33,795
Year of Completion/Acquisition	2007
Camden Clearbrook [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,384
Building/Construction in Progress & Improvements, Initial Cost	44,017
Cost Subsequent to Acquisition/Construction	98
Land, Total Cost	2,384
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	44,115
Total Cost	46,499
Accumulated Depreciation	7,875
Total Cost, Net of Accumulated Depreciation	38,624
Year of Completion/Acquisition	2007
Camden Club [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,453
Building/Construction in Progress & Improvements, Initial Cost	29,811
Cost Subsequent to Acquisition/Construction	7,100
Land, Total Cost	4,453
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	36,911
Total Cost	41,364
Accumulated Depreciation	21,164
Total Cost, Net of Accumulated Depreciation	20,200
Year of Completion/Acquisition	1998
Camden College Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	16,409
Building/Construction in Progress & Improvements, Initial Cost	91,503
Cost Subsequent to Acquisition/Construction	39
Land, Total Cost	16,409
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	91,542
Total Cost	107,951
Accumulated Depreciation	3,209
Total Cost, Net of Accumulated Depreciation	104,742
Year of Completion/Acquisition	2008
Camden Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,476
Building/Construction in Progress & Improvements, Initial Cost	20,073
Cost Subsequent to Acquisition/Construction	5,023
Land, Total Cost	2,476
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	25,096
Total Cost	27,572
Accumulated Depreciation	14,332
Total Cost, Net of Accumulated Depreciation	13,240
Year of Completion/Acquisition	1998
Camden Copper Ridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,204
Building/Construction in Progress & Improvements, Initial Cost	9,180
Cost Subsequent to Acquisition/Construction	4,824
Land, Total Cost	1,204
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	14,004
Total Cost	15,208
Accumulated Depreciation	9,450
Total Cost, Net of Accumulated Depreciation	5,758
Year of Completion/Acquisition	1993
Camden Copper Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,825
Building/Construction in Progress & Improvements, Initial Cost	23,672
Cost Subsequent to Acquisition/Construction	2,434
Land, Total Cost	4,825
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	26,106
Total Cost	30,931
Accumulated Depreciation	10,133
Total Cost, Net of Accumulated Depreciation	20,798
Year of Completion/Acquisition	2000
Camden Cotton Mills [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,246
Building/Construction in Progress & Improvements, Initial Cost	19,147
Cost Subsequent to Acquisition/Construction	2,059
Land, Total Cost	4,246
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	21,206
Total Cost	25,452
Accumulated Depreciation	4,783
Total Cost, Net of Accumulated Depreciation	20,669
Year of Completion/Acquisition	2005
Camden Cove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,382
Building/Construction in Progress & Improvements, Initial Cost	6,266
Cost Subsequent to Acquisition/Construction	1,397
Land, Total Cost	1,382
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	7,663
Total Cost	9,045
Accumulated Depreciation	4,199
Total Cost, Net of Accumulated Depreciation	4,846
Year of Completion/Acquisition	1998
Camden Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,494
Building/Construction in Progress & Improvements, Initial Cost	12,483
Cost Subsequent to Acquisition/Construction	5,532
Land, Total Cost	1,494
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	18,015
Total Cost	19,509
Accumulated Depreciation	13,157
Total Cost, Net of Accumulated Depreciation	6,352
Year of Completion/Acquisition	1993
Camden Crest [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,412
Building/Construction in Progress & Improvements, Initial Cost	33,366
Cost Subsequent to Acquisition/Construction	1,724
Land, Total Cost	4,412
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	35,090
Total Cost	39,502
Accumulated Depreciation	7,669
Total Cost, Net of Accumulated Depreciation	31,833
Year of Completion/Acquisition	2005
Camden Crown Valley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	9,381
Building/Construction in Progress & Improvements, Initial Cost	54,210
Cost Subsequent to Acquisition/Construction	2,006
Land, Total Cost	9,381
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	56,216
Total Cost	65,597
Accumulated Depreciation	18,672
Total Cost, Net of Accumulated Depreciation	46,925
Year of Completion/Acquisition	2001
Camden Deerfield [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,895
Building/Construction in Progress & Improvements, Initial Cost	21,922
Cost Subsequent to Acquisition/Construction	1,248
Land, Total Cost	4,895
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	23,170
Total Cost	28,065
Accumulated Depreciation	5,359
Total Cost, Net of Accumulated Depreciation	22,706
Encumbrances	19,220
Year of Completion/Acquisition	2005
Camden Del Mar [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,404
Building/Construction in Progress & Improvements, Initial Cost	35,264
Cost Subsequent to Acquisition/Construction	13,123
Land, Total Cost	4,404
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	48,387
Total Cost	52,791
Accumulated Depreciation	23,180
Total Cost, Net of Accumulated Depreciation	29,611
Year of Completion/Acquisition	1998
Camden Dilworth [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	516
Building/Construction in Progress & Improvements, Initial Cost	16,633
Cost Subsequent to Acquisition/Construction	129
Land, Total Cost	516
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	16,762
Total Cost	17,278
Accumulated Depreciation	3,403
Total Cost, Net of Accumulated Depreciation	13,875
Encumbrances	13,073
Year of Completion/Acquisition	2006
Camden Doral [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	10,260
Building/Construction in Progress & Improvements, Initial Cost	40,416
Cost Subsequent to Acquisition/Construction	1,109
Land, Total Cost	10,260
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	41,525
Total Cost	51,785
Accumulated Depreciation	8,877
Total Cost, Net of Accumulated Depreciation	42,908
Encumbrances	26,825
Year of Completion/Acquisition	2005
Camden Doral Villas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	6,476
Building/Construction in Progress & Improvements, Initial Cost	25,543
Cost Subsequent to Acquisition/Construction	1,507
Land, Total Cost	6,476
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	27,050
Total Cost	33,526
Accumulated Depreciation	6,055
Total Cost, Net of Accumulated Depreciation	27,471
Year of Completion/Acquisition	2005
Camden Dulles Station [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	10,807
Building/Construction in Progress & Improvements, Initial Cost	61,548
Cost Subsequent to Acquisition/Construction	111
Land, Total Cost	10,807
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	61,659
Total Cost	72,466
Accumulated Depreciation	8,169
Total Cost, Net of Accumulated Depreciation	64,297
Year of Completion/Acquisition	2008
Camden Dunwoody [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	5,290
Building/Construction in Progress & Improvements, Initial Cost	23,642
Cost Subsequent to Acquisition/Construction	1,767
Land, Total Cost	5,290
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	25,409
Total Cost	30,699
Accumulated Depreciation	5,665
Total Cost, Net of Accumulated Depreciation	25,034
Encumbrances	21,168
Year of Completion/Acquisition	2005
Camden Fair Lakes [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	15,515
Building/Construction in Progress & Improvements, Initial Cost	104,223
Cost Subsequent to Acquisition/Construction	3,100
Land, Total Cost	15,515
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	107,323
Total Cost	122,838
Accumulated Depreciation	22,104
Total Cost, Net of Accumulated Depreciation	100,734
Year of Completion/Acquisition	2005
Camden Fairfax Corner [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	8,484
Building/Construction in Progress & Improvements, Initial Cost	72,953
Cost Subsequent to Acquisition/Construction	212
Land, Total Cost	8,484
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	73,165
Total Cost	81,649
Accumulated Depreciation	14,428
Total Cost, Net of Accumulated Depreciation	67,221
Year of Completion/Acquisition	2006
Camden Fairview [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,283
Building/Construction in Progress & Improvements, Initial Cost	7,223
Cost Subsequent to Acquisition/Construction	1,411
Land, Total Cost	1,283
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	8,634
Total Cost	9,917
Accumulated Depreciation	2,220
Total Cost, Net of Accumulated Depreciation	7,697
Year of Completion/Acquisition	2005
Camden Fairways [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,969
Building/Construction in Progress & Improvements, Initial Cost	15,543
Cost Subsequent to Acquisition/Construction	8,621
Land, Total Cost	3,969
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	24,164
Total Cost	28,133
Accumulated Depreciation	12,909
Total Cost, Net of Accumulated Depreciation	15,224
Year of Completion/Acquisition	1998
Camden Fallsgrove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	9,408
Building/Construction in Progress & Improvements, Initial Cost	43,647
Cost Subsequent to Acquisition/Construction	923
Land, Total Cost	9,408
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	44,570
Total Cost	53,978
Accumulated Depreciation	9,508
Total Cost, Net of Accumulated Depreciation	44,470
Year of Completion/Acquisition	2005
Camden Farmers Market [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	17,341
Building/Construction in Progress & Improvements, Initial Cost	74,193
Cost Subsequent to Acquisition/Construction	3,706
Land, Total Cost	17,341
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	77,899
Total Cost	95,240
Accumulated Depreciation	25,036
Total Cost, Net of Accumulated Depreciation	70,204
Encumbrances	50,711
Year of Completion/Acquisition	2001/2005
Camden Forest [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	970
Building/Construction in Progress & Improvements, Initial Cost	7,209
Cost Subsequent to Acquisition/Construction	2,521
Land, Total Cost	970
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	9,730
Total Cost	10,700
Accumulated Depreciation	5,720
Total Cost, Net of Accumulated Depreciation	4,980
Year of Completion/Acquisition	1997
Camden Foxcroft [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,408
Building/Construction in Progress & Improvements, Initial Cost	7,919
Cost Subsequent to Acquisition/Construction	2,472
Land, Total Cost	1,408
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	10,391
Total Cost	11,799
Accumulated Depreciation	2,736
Total Cost, Net of Accumulated Depreciation	9,063
Encumbrances	9,040
Year of Completion/Acquisition	2005
Camden Gaines Ranch [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	5,094
Building/Construction in Progress & Improvements, Initial Cost	37,100
Cost Subsequent to Acquisition/Construction	2,593
Land, Total Cost	5,094
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	39,693
Total Cost	44,787
Accumulated Depreciation	8,055
Total Cost, Net of Accumulated Depreciation	36,732
Year of Completion/Acquisition	2005
Camden Gardens [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,500
Building/Construction in Progress & Improvements, Initial Cost	6,137
Cost Subsequent to Acquisition/Construction	2,892
Land, Total Cost	1,500
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	9,029
Total Cost	10,529
Accumulated Depreciation	6,310
Total Cost, Net of Accumulated Depreciation	4,219
Year of Completion/Acquisition	1994
Camden Glen Lakes [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,157
Building/Construction in Progress & Improvements, Initial Cost	16,339
Cost Subsequent to Acquisition/Construction	13,076
Land, Total Cost	2,157
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	29,415
Total Cost	31,572
Accumulated Depreciation	22,952
Total Cost, Net of Accumulated Depreciation	8,620
Year of Completion/Acquisition	1993
Camden Governor's Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,669
Building/Construction in Progress & Improvements, Initial Cost	20,508
Cost Subsequent to Acquisition/Construction	1,486
Land, Total Cost	3,669
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	21,994
Total Cost	25,663
Accumulated Depreciation	5,084
Total Cost, Net of Accumulated Depreciation	20,579
Encumbrances	13,004
Year of Completion/Acquisition	2005
Camden Grand Parc [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	7,688
Building/Construction in Progress & Improvements, Initial Cost	35,900
Cost Subsequent to Acquisition/Construction	669
Land, Total Cost	7,688
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	36,569
Total Cost	44,257
Accumulated Depreciation	7,715
Total Cost, Net of Accumulated Depreciation	36,542
Year of Completion/Acquisition	2005
Camden Grandview [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	7,570
Building/Construction in Progress & Improvements, Initial Cost	33,859
Cost Subsequent to Acquisition/Construction	3,410
Land, Total Cost	7,570
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	37,269
Total Cost	44,839
Accumulated Depreciation	8,396
Total Cost, Net of Accumulated Depreciation	36,443
Year of Completion/Acquisition	2005
Camden Greenway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	16,916
Building/Construction in Progress & Improvements, Initial Cost	43,933
Cost Subsequent to Acquisition/Construction	4,901
Land, Total Cost	16,916
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	48,834
Total Cost	65,750
Accumulated Depreciation	20,160
Total Cost, Net of Accumulated Depreciation	45,590
Encumbrances	52,359
Year of Completion/Acquisition	1999
Camden Habersham [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,004
Building/Construction in Progress & Improvements, Initial Cost	10,283
Cost Subsequent to Acquisition/Construction	2,941
Land, Total Cost	1,004
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	13,224
Total Cost	14,228
Accumulated Depreciation	8,254
Total Cost, Net of Accumulated Depreciation	5,974
Year of Completion/Acquisition	1997
Camden Harbor View [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	16,079
Building/Construction in Progress & Improvements, Initial Cost	127,459
Cost Subsequent to Acquisition/Construction	2,038
Land, Total Cost	16,079
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	129,497
Total Cost	145,576
Accumulated Depreciation	33,131
Total Cost, Net of Accumulated Depreciation	112,445
Encumbrances	92,716
Year of Completion/Acquisition	2003
Camden Highlands Ridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,612
Building/Construction in Progress & Improvements, Initial Cost	34,726
Cost Subsequent to Acquisition/Construction	3,813
Land, Total Cost	2,612
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	38,539
Total Cost	41,151
Accumulated Depreciation	15,216
Total Cost, Net of Accumulated Depreciation	25,935
Year of Completion/Acquisition	1996
Camden Hills [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	853
Building/Construction in Progress & Improvements, Initial Cost	7,834
Cost Subsequent to Acquisition/Construction	1,351
Land, Total Cost	853
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	9,185
Total Cost	10,038
Accumulated Depreciation	4,863
Total Cost, Net of Accumulated Depreciation	5,175
Year of Completion/Acquisition	1998
Camden Hunter's Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,156
Building/Construction in Progress & Improvements, Initial Cost	20,925
Cost Subsequent to Acquisition/Construction	1,088
Land, Total Cost	4,156
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	22,013
Total Cost	26,169
Accumulated Depreciation	5,013
Total Cost, Net of Accumulated Depreciation	21,156
Year of Completion/Acquisition	2005
Camden Huntingdon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,289
Building/Construction in Progress & Improvements, Initial Cost	17,393
Cost Subsequent to Acquisition/Construction	2,958
Land, Total Cost	2,289
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	20,351
Total Cost	22,640
Accumulated Depreciation	10,779
Total Cost, Net of Accumulated Depreciation	11,861
Year of Completion/Acquisition	1995
Camden Interlocken [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	5,293
Building/Construction in Progress & Improvements, Initial Cost	31,612
Cost Subsequent to Acquisition/Construction	4,124
Land, Total Cost	5,293
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	35,736
Total Cost	41,029
Accumulated Depreciation	14,171
Total Cost, Net of Accumulated Depreciation	26,858
Encumbrances	27,431
Year of Completion/Acquisition	1999
Camden Lago Vista [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,497
Building/Construction in Progress & Improvements, Initial Cost	29,623
Cost Subsequent to Acquisition/Construction	437
Land, Total Cost	3,497
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	30,060
Total Cost	33,557
Accumulated Depreciation	7,481
Total Cost, Net of Accumulated Depreciation	26,076
Year of Completion/Acquisition	2005
Camden Lake Pine [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	5,746
Building/Construction in Progress & Improvements, Initial Cost	31,714
Cost Subsequent to Acquisition/Construction	2,763
Land, Total Cost	5,746
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	34,477
Total Cost	40,223
Accumulated Depreciation	7,897
Total Cost, Net of Accumulated Depreciation	32,326
Encumbrances	26,212
Year of Completion/Acquisition	2005
Camden Lakes [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,106
Building/Construction in Progress & Improvements, Initial Cost	22,746
Cost Subsequent to Acquisition/Construction	10,630
Land, Total Cost	3,106
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	33,376
Total Cost	36,482
Accumulated Depreciation	22,085
Total Cost, Net of Accumulated Depreciation	14,397
Year of Completion/Acquisition	1997
Camden Lakeside [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,171
Building/Construction in Progress & Improvements, Initial Cost	7,395
Cost Subsequent to Acquisition/Construction	4,027
Land, Total Cost	1,171
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	11,422
Total Cost	12,593
Accumulated Depreciation	7,093
Total Cost, Net of Accumulated Depreciation	5,500
Year of Completion/Acquisition	1997
Camden Lakeway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,915
Building/Construction in Progress & Improvements, Initial Cost	34,129
Cost Subsequent to Acquisition/Construction	4,449
Land, Total Cost	3,915
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	38,578
Total Cost	42,493
Accumulated Depreciation	16,637
Total Cost, Net of Accumulated Depreciation	25,856
Encumbrances	29,267
Year of Completion/Acquisition	1997
Camden Landings [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,045
Building/Construction in Progress & Improvements, Initial Cost	6,434
Cost Subsequent to Acquisition/Construction	3,786
Land, Total Cost	1,045
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	10,220
Total Cost	11,265
Accumulated Depreciation	6,649
Total Cost, Net of Accumulated Depreciation	4,616
Year of Completion/Acquisition	1997
Camden Landsdowne [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	15,502
Building/Construction in Progress & Improvements, Initial Cost	102,267
Cost Subsequent to Acquisition/Construction	2,343
Land, Total Cost	15,502
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	104,610
Total Cost	120,112
Accumulated Depreciation	22,634
Total Cost, Net of Accumulated Depreciation	97,478
Year of Completion/Acquisition	2005
Camden Largo Town Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	8,411
Building/Construction in Progress & Improvements, Initial Cost	44,163
Cost Subsequent to Acquisition/Construction	1,301
Land, Total Cost	8,411
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	45,464
Total Cost	53,875
Accumulated Depreciation	9,390
Total Cost, Net of Accumulated Depreciation	44,485
Year of Completion/Acquisition	2005
Camden Las Olas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	12,395
Building/Construction in Progress & Improvements, Initial Cost	79,518
Cost Subsequent to Acquisition/Construction	1,678
Land, Total Cost	12,395
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	81,196
Total Cost	93,591
Accumulated Depreciation	17,690
Total Cost, Net of Accumulated Depreciation	75,901
Year of Completion/Acquisition	2005
Camden Laurel Ridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	915
Building/Construction in Progress & Improvements, Initial Cost	4,338
Cost Subsequent to Acquisition/Construction	2,436
Land, Total Cost	915
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	6,774
Total Cost	7,689
Accumulated Depreciation	4,510
Total Cost, Net of Accumulated Depreciation	3,179
Year of Completion/Acquisition	1994
Camden Lee Vista [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,350
Building/Construction in Progress & Improvements, Initial Cost	34,643
Cost Subsequent to Acquisition/Construction	3,463
Land, Total Cost	4,350
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	38,106
Total Cost	42,456
Accumulated Depreciation	13,881
Total Cost, Net of Accumulated Depreciation	28,575
Year of Completion/Acquisition	2000
Camden Legacy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,068
Building/Construction in Progress & Improvements, Initial Cost	26,612
Cost Subsequent to Acquisition/Construction	4,423
Land, Total Cost	4,068
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	31,035
Total Cost	35,103
Accumulated Depreciation	14,713
Total Cost, Net of Accumulated Depreciation	20,390
Year of Completion/Acquisition	1998
Camden Legacy Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,052
Building/Construction in Progress & Improvements, Initial Cost	12,896
Cost Subsequent to Acquisition/Construction	2,267
Land, Total Cost	2,052
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	15,163
Total Cost	17,215
Accumulated Depreciation	7,117
Total Cost, Net of Accumulated Depreciation	10,098
Year of Completion/Acquisition	1997
Camden Legacy Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,560
Building/Construction in Progress & Improvements, Initial Cost	15,449
Cost Subsequent to Acquisition/Construction	2,840
Land, Total Cost	2,560
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	18,289
Total Cost	20,849
Accumulated Depreciation	8,281
Total Cost, Net of Accumulated Depreciation	12,568
Encumbrances	13,866
Year of Completion/Acquisition	1997
Camden Legends [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,370
Building/Construction in Progress & Improvements, Initial Cost	6,382
Cost Subsequent to Acquisition/Construction	917
Land, Total Cost	1,370
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	7,299
Total Cost	8,669
Accumulated Depreciation	3,507
Total Cost, Net of Accumulated Depreciation	5,162
Year of Completion/Acquisition	1998
Camden Live Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	6,428
Building/Construction in Progress & Improvements, Initial Cost	39,127
Cost Subsequent to Acquisition/Construction	13,373
Land, Total Cost	6,428
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	52,500
Total Cost	58,928
Accumulated Depreciation	26,984
Total Cost, Net of Accumulated Depreciation	31,944
Year of Completion/Acquisition	1998
Camden Main & Jamboree [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	17,363
Building/Construction in Progress & Improvements, Initial Cost	75,387
Cost Subsequent to Acquisition/Construction	20
Land, Total Cost	17,363
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	75,407
Total Cost	92,770
Accumulated Depreciation	3,602
Total Cost, Net of Accumulated Depreciation	89,168
Encumbrances	52,130
Year of Completion/Acquisition	2008
Camden Manor Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,535
Building/Construction in Progress & Improvements, Initial Cost	47,159
Cost Subsequent to Acquisition/Construction	349
Land, Total Cost	2,535
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	47,508
Total Cost	50,043
Accumulated Depreciation	10,225
Total Cost, Net of Accumulated Depreciation	39,818
Encumbrances	29,675
Year of Completion/Acquisition	2006
Camden Martinique [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	28,401
Building/Construction in Progress & Improvements, Initial Cost	51,861
Cost Subsequent to Acquisition/Construction	10,747
Land, Total Cost	28,401
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	62,608
Total Cost	91,009
Accumulated Depreciation	26,928
Total Cost, Net of Accumulated Depreciation	64,081
Encumbrances	39,061
Year of Completion/Acquisition	1998
Camden Midtown [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,583
Building/Construction in Progress & Improvements, Initial Cost	18,026
Cost Subsequent to Acquisition/Construction	3,273
Land, Total Cost	4,583
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	21,299
Total Cost	25,882
Accumulated Depreciation	8,776
Total Cost, Net of Accumulated Depreciation	17,106
Encumbrances	28,058
Year of Completion/Acquisition	1999
Camden Midtown Atlanta [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	6,196
Building/Construction in Progress & Improvements, Initial Cost	33,828
Cost Subsequent to Acquisition/Construction	2,107
Land, Total Cost	6,196
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	35,935
Total Cost	42,131
Accumulated Depreciation	8,335
Total Cost, Net of Accumulated Depreciation	33,796
Encumbrances	20,565
Year of Completion/Acquisition	2005
Camden Miramar [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	31,655
Cost Subsequent to Acquisition/Construction	6,430
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	38,085
Total Cost	38,085
Accumulated Depreciation	13,906
Total Cost, Net of Accumulated Depreciation	24,179
Year of Completion/Acquisition	1994-2011
Camden Monument Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	9,030
Building/Construction in Progress & Improvements, Initial Cost	54,089
Cost Subsequent to Acquisition/Construction	47
Land, Total Cost	9,030
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	54,136
Total Cost	63,166
Accumulated Depreciation	9,101
Total Cost, Net of Accumulated Depreciation	54,065
Year of Completion/Acquisition	2007
Camden Oak Crest [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,078
Building/Construction in Progress & Improvements, Initial Cost	20,941
Cost Subsequent to Acquisition/Construction	1,051
Land, Total Cost	2,078
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	21,992
Total Cost	24,070
Accumulated Depreciation	7,061
Total Cost, Net of Accumulated Depreciation	17,009
Encumbrances	17,309
Year of Completion/Acquisition	2003
Camden Old Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	20,360
Building/Construction in Progress & Improvements, Initial Cost	71,777
Cost Subsequent to Acquisition/Construction	203
Land, Total Cost	20,360
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	71,980
Total Cost	92,340
Accumulated Depreciation	12,622
Total Cost, Net of Accumulated Depreciation	79,718
Year of Completion/Acquisition	2007
Camden Orange Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	5,319
Building/Construction in Progress & Improvements, Initial Cost	40,733
Cost Subsequent to Acquisition/Construction	63
Land, Total Cost	5,319
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	40,796
Total Cost	46,115
Accumulated Depreciation	5,907
Total Cost, Net of Accumulated Depreciation	40,208
Year of Completion/Acquisition	2008
Camden Overlook [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,591
Building/Construction in Progress & Improvements, Initial Cost	25,563
Cost Subsequent to Acquisition/Construction	2,606
Land, Total Cost	4,591
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	28,169
Total Cost	32,760
Accumulated Depreciation	6,707
Total Cost, Net of Accumulated Depreciation	26,053
Encumbrances	19,546
Year of Completion/Acquisition	2005
Camden Palisades [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	8,406
Building/Construction in Progress & Improvements, Initial Cost	31,497
Cost Subsequent to Acquisition/Construction	7,080
Land, Total Cost	8,406
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	38,577
Total Cost	46,983
Accumulated Depreciation	18,074
Total Cost, Net of Accumulated Depreciation	28,909
Year of Completion/Acquisition	1998
Camden Park Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,146
Building/Construction in Progress & Improvements, Initial Cost	11,311
Cost Subsequent to Acquisition/Construction	1,916
Land, Total Cost	1,146
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	13,227
Total Cost	14,373
Accumulated Depreciation	6,351
Total Cost, Net of Accumulated Depreciation	8,022
Year of Completion/Acquisition	1997
Camden Peachtree City [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	6,536
Building/Construction in Progress & Improvements, Initial Cost	29,063
Cost Subsequent to Acquisition/Construction	1,637
Land, Total Cost	6,536
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	30,700
Total Cost	37,236
Accumulated Depreciation	7,203
Total Cost, Net of Accumulated Depreciation	30,033
Year of Completion/Acquisition	2005
Camden Pinehurst [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,380
Building/Construction in Progress & Improvements, Initial Cost	14,807
Cost Subsequent to Acquisition/Construction	6,568
Land, Total Cost	3,380
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	21,375
Total Cost	24,755
Accumulated Depreciation	19,715
Total Cost, Net of Accumulated Depreciation	5,040
Year of Completion/Acquisition	1997
Camden Pinnacle [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,640
Building/Construction in Progress & Improvements, Initial Cost	12,287
Cost Subsequent to Acquisition/Construction	2,508
Land, Total Cost	1,640
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	14,795
Total Cost	16,435
Accumulated Depreciation	7,195
Total Cost, Net of Accumulated Depreciation	9,240
Year of Completion/Acquisition	1994
Camden Plantation [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	6,299
Building/Construction in Progress & Improvements, Initial Cost	77,964
Cost Subsequent to Acquisition/Construction	4,270
Land, Total Cost	6,299
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	82,234
Total Cost	88,533
Accumulated Depreciation	17,357
Total Cost, Net of Accumulated Depreciation	71,176
Year of Completion/Acquisition	2005
Camden Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	7,204
Building/Construction in Progress & Improvements, Initial Cost	31,044
Cost Subsequent to Acquisition/Construction	95
Land, Total Cost	7,204
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	31,139
Total Cost	38,343
Accumulated Depreciation	1,170
Total Cost, Net of Accumulated Depreciation	37,173
Encumbrances	22,214
Year of Completion/Acquisition	2007
Camden Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,058
Building/Construction in Progress & Improvements, Initial Cost	14,879
Cost Subsequent to Acquisition/Construction	2,274
Land, Total Cost	2,058
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	17,153
Total Cost	19,211
Accumulated Depreciation	7,836
Total Cost, Net of Accumulated Depreciation	11,375
Year of Completion/Acquisition	1998
Camden Portofino [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	9,867
Building/Construction in Progress & Improvements, Initial Cost	38,702
Cost Subsequent to Acquisition/Construction	2,300
Land, Total Cost	9,867
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	41,002
Total Cost	50,869
Accumulated Depreciation	8,701
Total Cost, Net of Accumulated Depreciation	42,168
Year of Completion/Acquisition	2005
Camden Potomac Yard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	16,498
Building/Construction in Progress & Improvements, Initial Cost	88,317
Cost Subsequent to Acquisition/Construction	51
Land, Total Cost	16,498
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	88,368
Total Cost	104,866
Accumulated Depreciation	13,075
Total Cost, Net of Accumulated Depreciation	91,791
Year of Completion/Acquisition	2008
Camden Preserve [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,206
Building/Construction in Progress & Improvements, Initial Cost	17,982
Cost Subsequent to Acquisition/Construction	2,536
Land, Total Cost	1,206
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	20,518
Total Cost	21,724
Accumulated Depreciation	8,411
Total Cost, Net of Accumulated Depreciation	13,313
Year of Completion/Acquisition	1997
Camden Providence Lakes [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,020
Building/Construction in Progress & Improvements, Initial Cost	14,855
Cost Subsequent to Acquisition/Construction	4,723
Land, Total Cost	2,020
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	19,578
Total Cost	21,598
Accumulated Depreciation	6,740
Total Cost, Net of Accumulated Depreciation	14,858
Year of Completion/Acquisition	2002
Camden Renaissance [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,144
Building/Construction in Progress & Improvements, Initial Cost	39,987
Cost Subsequent to Acquisition/Construction	3,763
Land, Total Cost	4,144
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	43,750
Total Cost	47,894
Accumulated Depreciation	16,949
Total Cost, Net of Accumulated Depreciation	30,945
Year of Completion/Acquisition	1997
Camden Reserve [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,910
Building/Construction in Progress & Improvements, Initial Cost	20,027
Cost Subsequent to Acquisition/Construction	7,438
Land, Total Cost	3,910
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	27,465
Total Cost	31,375
Accumulated Depreciation	15,300
Total Cost, Net of Accumulated Depreciation	16,075
Year of Completion/Acquisition	1997
Camden Reunion Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,302
Building/Construction in Progress & Improvements, Initial Cost	18,457
Cost Subsequent to Acquisition/Construction	1,661
Land, Total Cost	3,302
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	20,118
Total Cost	23,420
Accumulated Depreciation	4,680
Total Cost, Net of Accumulated Depreciation	18,740
Encumbrances	19,961
Year of Completion/Acquisition	2005
Camden Ridgecrest [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,008
Building/Construction in Progress & Improvements, Initial Cost	12,720
Cost Subsequent to Acquisition/Construction	2,528
Land, Total Cost	1,008
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	15,248
Total Cost	16,256
Accumulated Depreciation	7,970
Total Cost, Net of Accumulated Depreciation	8,286
Year of Completion/Acquisition	1995
Camden River [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	5,386
Building/Construction in Progress & Improvements, Initial Cost	24,025
Cost Subsequent to Acquisition/Construction	2,863
Land, Total Cost	5,386
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	26,888
Total Cost	32,274
Accumulated Depreciation	6,344
Total Cost, Net of Accumulated Depreciation	25,930
Encumbrances	21,614
Year of Completion/Acquisition	2005
Camden Roosevelt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	11,470
Building/Construction in Progress & Improvements, Initial Cost	45,785
Cost Subsequent to Acquisition/Construction	481
Land, Total Cost	11,470
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	46,266
Total Cost	57,736
Accumulated Depreciation	10,103
Total Cost, Net of Accumulated Depreciation	47,633
Year of Completion/Acquisition	2005
Camden Royal Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,055
Building/Construction in Progress & Improvements, Initial Cost	20,046
Cost Subsequent to Acquisition/Construction	160
Land, Total Cost	1,055
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	20,206
Total Cost	21,261
Accumulated Depreciation	4,780
Total Cost, Net of Accumulated Depreciation	16,481
Year of Completion/Acquisition	2006
Camden Royal Palms [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,147
Building/Construction in Progress & Improvements, Initial Cost	38,339
Cost Subsequent to Acquisition/Construction	788
Land, Total Cost	2,147
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	39,127
Total Cost	41,274
Accumulated Depreciation	6,065
Total Cost, Net of Accumulated Depreciation	35,209
Year of Completion/Acquisition	2007
Camden Russett [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	13,460
Building/Construction in Progress & Improvements, Initial Cost	61,837
Cost Subsequent to Acquisition/Construction	2,101
Land, Total Cost	13,460
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	63,938
Total Cost	77,398
Accumulated Depreciation	13,632
Total Cost, Net of Accumulated Depreciation	63,766
Encumbrances	45,063
Year of Completion/Acquisition	2005
Camden San Paloma [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	6,480
Building/Construction in Progress & Improvements, Initial Cost	23,045
Cost Subsequent to Acquisition/Construction	3,139
Land, Total Cost	6,480
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	26,184
Total Cost	32,664
Accumulated Depreciation	8,237
Total Cost, Net of Accumulated Depreciation	24,427
Year of Completion/Acquisition	2002
Camden Sea Palms [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,336
Building/Construction in Progress & Improvements, Initial Cost	9,930
Cost Subsequent to Acquisition/Construction	2,157
Land, Total Cost	4,336
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	12,087
Total Cost	16,423
Accumulated Depreciation	5,679
Total Cost, Net of Accumulated Depreciation	10,744
Year of Completion/Acquisition	1998
Camden Sedgebrook [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	5,266
Building/Construction in Progress & Improvements, Initial Cost	29,211
Cost Subsequent to Acquisition/Construction	2,049
Land, Total Cost	5,266
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	31,260
Total Cost	36,526
Accumulated Depreciation	6,930
Total Cost, Net of Accumulated Depreciation	29,596
Encumbrances	21,306
Year of Completion/Acquisition	2005
Camden Shiloh [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,181
Building/Construction in Progress & Improvements, Initial Cost	18,798
Cost Subsequent to Acquisition/Construction	1,089
Land, Total Cost	4,181
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	19,887
Total Cost	24,068
Accumulated Depreciation	4,817
Total Cost, Net of Accumulated Depreciation	19,251
Encumbrances	10,576
Year of Completion/Acquisition	2005
Camden Sierra At Otay [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	10,585
Building/Construction in Progress & Improvements, Initial Cost	49,781
Cost Subsequent to Acquisition/Construction	1,436
Land, Total Cost	10,585
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	51,217
Total Cost	61,802
Accumulated Depreciation	13,779
Total Cost, Net of Accumulated Depreciation	48,023
Year of Completion/Acquisition	2003
Camden Silo Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	9,707
Building/Construction in Progress & Improvements, Initial Cost	45,144
Cost Subsequent to Acquisition/Construction	734
Land, Total Cost	9,707
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	45,878
Total Cost	55,585
Accumulated Depreciation	9,716
Total Cost, Net of Accumulated Depreciation	45,869
Year of Completion/Acquisition	2005
Camden Simsbury [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,152
Building/Construction in Progress & Improvements, Initial Cost	6,499
Cost Subsequent to Acquisition/Construction	994
Land, Total Cost	1,152
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	7,493
Total Cost	8,645
Accumulated Depreciation	1,607
Total Cost, Net of Accumulated Depreciation	7,038
Year of Completion/Acquisition	2005
Camden South End Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	6,625
Building/Construction in Progress & Improvements, Initial Cost	29,175
Cost Subsequent to Acquisition/Construction	1,438
Land, Total Cost	6,625
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	30,613
Total Cost	37,238
Accumulated Depreciation	6,913
Total Cost, Net of Accumulated Depreciation	30,325
Year of Completion/Acquisition	2005
Camden Springs [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,520
Building/Construction in Progress & Improvements, Initial Cost	8,300
Cost Subsequent to Acquisition/Construction	3,791
Land, Total Cost	1,520
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	12,091
Total Cost	13,611
Accumulated Depreciation	9,444
Total Cost, Net of Accumulated Depreciation	4,167
Year of Completion/Acquisition	1994
Camden St. Clair [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	7,526
Building/Construction in Progress & Improvements, Initial Cost	27,486
Cost Subsequent to Acquisition/Construction	2,252
Land, Total Cost	7,526
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	29,738
Total Cost	37,264
Accumulated Depreciation	6,567
Total Cost, Net of Accumulated Depreciation	30,697
Encumbrances	21,646
Year of Completion/Acquisition	2005
Camden Steeplechase [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,089
Building/Construction in Progress & Improvements, Initial Cost	5,190
Cost Subsequent to Acquisition/Construction	4,621
Land, Total Cost	1,089
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	9,811
Total Cost	10,900
Accumulated Depreciation	7,431
Total Cost, Net of Accumulated Depreciation	3,469
Year of Completion/Acquisition	1994
Camden Stockbridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	5,071
Building/Construction in Progress & Improvements, Initial Cost	22,693
Cost Subsequent to Acquisition/Construction	1,183
Land, Total Cost	5,071
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	23,876
Total Cost	28,947
Accumulated Depreciation	5,746
Total Cost, Net of Accumulated Depreciation	23,201
Encumbrances	14,332
Year of Completion/Acquisition	2005
Camden Stonebridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,016
Building/Construction in Progress & Improvements, Initial Cost	7,137
Cost Subsequent to Acquisition/Construction	2,527
Land, Total Cost	1,016
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	9,664
Total Cost	10,680
Accumulated Depreciation	5,582
Total Cost, Net of Accumulated Depreciation	5,098
Year of Completion/Acquisition	1993
Camden Stonecrest [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,954
Building/Construction in Progress & Improvements, Initial Cost	22,021
Cost Subsequent to Acquisition/Construction	2,117
Land, Total Cost	3,954
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	24,138
Total Cost	28,092
Accumulated Depreciation	5,289
Total Cost, Net of Accumulated Depreciation	22,803
Encumbrances	16,920
Year of Completion/Acquisition	2005
Camden Stoneleigh [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,498
Building/Construction in Progress & Improvements, Initial Cost	31,285
Cost Subsequent to Acquisition/Construction	1,670
Land, Total Cost	3,498
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	32,955
Total Cost	36,453
Accumulated Depreciation	6,276
Total Cost, Net of Accumulated Depreciation	30,177
Year of Completion/Acquisition	2006
Camden Summerfield [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	14,659
Building/Construction in Progress & Improvements, Initial Cost	48,404
Cost Subsequent to Acquisition/Construction	141
Land, Total Cost	14,659
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	48,545
Total Cost	63,204
Accumulated Depreciation	7,486
Total Cost, Net of Accumulated Depreciation	55,718
Year of Completion/Acquisition	2008
Camden Sweetwater [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,395
Building/Construction in Progress & Improvements, Initial Cost	19,664
Cost Subsequent to Acquisition/Construction	1,381
Land, Total Cost	4,395
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	21,045
Total Cost	25,440
Accumulated Depreciation	5,054
Total Cost, Net of Accumulated Depreciation	20,386
Year of Completion/Acquisition	2005
Camden Touchstone [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,203
Building/Construction in Progress & Improvements, Initial Cost	6,772
Cost Subsequent to Acquisition/Construction	1,928
Land, Total Cost	1,203
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	8,700
Total Cost	9,903
Accumulated Depreciation	2,411
Total Cost, Net of Accumulated Depreciation	7,492
Year of Completion/Acquisition	2005
Camden Travis Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,780
Building/Construction in Progress & Improvements, Initial Cost	29,104
Cost Subsequent to Acquisition/Construction	44
Land, Total Cost	1,780
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	29,148
Total Cost	30,928
Accumulated Depreciation	2,852
Total Cost, Net of Accumulated Depreciation	28,076
Encumbrances	31,476
Year of Completion/Acquisition	2010
Camden Tuscany [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,330
Building/Construction in Progress & Improvements, Initial Cost	36,466
Cost Subsequent to Acquisition/Construction	698
Land, Total Cost	3,330
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	37,164
Total Cost	40,494
Accumulated Depreciation	9,859
Total Cost, Net of Accumulated Depreciation	30,635
Year of Completion/Acquisition	2003
Camden Valley Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,096
Building/Construction in Progress & Improvements, Initial Cost	14,667
Cost Subsequent to Acquisition/Construction	11,947
Land, Total Cost	3,096
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	26,614
Total Cost	29,710
Accumulated Depreciation	19,016
Total Cost, Net of Accumulated Depreciation	10,694
Year of Completion/Acquisition	1994
Camden Valleybrook [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	7,340
Building/Construction in Progress & Improvements, Initial Cost	39,139
Cost Subsequent to Acquisition/Construction	1,322
Land, Total Cost	7,340
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	40,461
Total Cost	47,801
Accumulated Depreciation	9,010
Total Cost, Net of Accumulated Depreciation	38,791
Year of Completion/Acquisition	2005
Camden Vanderbilt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	16,076
Building/Construction in Progress & Improvements, Initial Cost	44,918
Cost Subsequent to Acquisition/Construction	12,642
Land, Total Cost	16,076
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	57,560
Total Cost	73,636
Accumulated Depreciation	28,224
Total Cost, Net of Accumulated Depreciation	45,412
Encumbrances	73,165
Year of Completion/Acquisition	1994/1997
Camden Vineyards [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,367
Building/Construction in Progress & Improvements, Initial Cost	28,494
Cost Subsequent to Acquisition/Construction	1,085
Land, Total Cost	4,367
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	29,579
Total Cost	33,946
Accumulated Depreciation	8,965
Total Cost, Net of Accumulated Depreciation	24,981
Year of Completion/Acquisition	2002
Camden Vintage [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	3,641
Building/Construction in Progress & Improvements, Initial Cost	19,255
Cost Subsequent to Acquisition/Construction	4,334
Land, Total Cost	3,641
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	23,589
Total Cost	27,230
Accumulated Depreciation	12,328
Total Cost, Net of Accumulated Depreciation	14,902
Year of Completion/Acquisition	1998
Camden Westshore [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,734
Building/Construction in Progress & Improvements, Initial Cost	10,819
Cost Subsequent to Acquisition/Construction	5,869
Land, Total Cost	1,734
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	16,688
Total Cost	18,422
Accumulated Depreciation	9,845
Total Cost, Net of Accumulated Depreciation	8,577
Year of Completion/Acquisition	1997
Camden Westview [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,031
Building/Construction in Progress & Improvements, Initial Cost	7,932
Cost Subsequent to Acquisition/Construction	4,172
Land, Total Cost	1,031
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	12,104
Total Cost	13,135
Accumulated Depreciation	8,224
Total Cost, Net of Accumulated Depreciation	4,911
Year of Completion/Acquisition	1993
Camden Westwood [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,567
Building/Construction in Progress & Improvements, Initial Cost	25,519
Cost Subsequent to Acquisition/Construction	1,417
Land, Total Cost	4,567
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	26,936
Total Cost	31,503
Accumulated Depreciation	6,042
Total Cost, Net of Accumulated Depreciation	25,461
Encumbrances	19,907
Year of Completion/Acquisition	2005
Camden Whispering Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	1,188
Building/Construction in Progress & Improvements, Initial Cost	26,242
Cost Subsequent to Acquisition/Construction	70
Land, Total Cost	1,188
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	26,312
Total Cost	27,500
Accumulated Depreciation	4,162
Total Cost, Net of Accumulated Depreciation	23,338
Year of Completion/Acquisition	2008
Camden Woods [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	2,693
Building/Construction in Progress & Improvements, Initial Cost	19,930
Cost Subsequent to Acquisition/Construction	8,012
Land, Total Cost	2,693
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	27,942
Total Cost	30,635
Accumulated Depreciation	16,448
Total Cost, Net of Accumulated Depreciation	14,187
Year of Completion/Acquisition	1999
Camden World Gateway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	5,785
Building/Construction in Progress & Improvements, Initial Cost	51,821
Cost Subsequent to Acquisition/Construction	1,598
Land, Total Cost	5,785
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	53,419
Total Cost	59,204
Accumulated Depreciation	10,856
Total Cost, Net of Accumulated Depreciation	48,348
Year of Completion/Acquisition	2005
Camden La Vina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	12,907
Building/Construction in Progress & Improvements, Initial Cost	41,852
Land, Total Cost	12,907
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	41,852
Total Cost	54,759
Accumulated Depreciation	511
Total Cost, Net of Accumulated Depreciation	54,248
Year of Completion/Acquisition	N/A
Camden Summerfield II [Member] | Lease-Up Development Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Land, Initial Cost	4,459
Building/Construction in Progress & Improvements, Initial Cost	19,840
Land, Total Cost	4,459
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	19,840
Total Cost	24,299
Accumulated Depreciation	150
Total Cost, Net of Accumulated Depreciation	24,149
Year of Completion/Acquisition	N/A
Camden City Centre II [Member] | Development Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	10,148
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	10,148
Total Cost	10,148
Total Cost, Net of Accumulated Depreciation	10,148
Year of Completion/Acquisition	N/A
Camden Montague [Member] | Development Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	13,364
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	13,364
Total Cost	13,364
Accumulated Depreciation	2
Total Cost, Net of Accumulated Depreciation	13,362
Year of Completion/Acquisition	N/A
Camden NOMA [Member] | Development Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	39,022
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	39,022
Total Cost	39,022
Accumulated Depreciation	2
Total Cost, Net of Accumulated Depreciation	39,020
Year of Completion/Acquisition	N/A
Camden Royal Oaks II [Member] | Development Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	11,085
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	11,085
Total Cost	11,085
Accumulated Depreciation	13
Total Cost, Net of Accumulated Depreciation	11,072
Year of Completion/Acquisition	N/A
Camden Town Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	28,653
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	28,653
Total Cost	28,653
Total Cost, Net of Accumulated Depreciation	28,653
Year of Completion/Acquisition	N/A
Camden Westchase Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Building/Construction in Progress & Improvements, Initial Cost	29,590
Building/Construction in Progress & Improvements, Initial Cost, Total Cost	29,590
Total Cost	29,590
Accumulated Depreciation	1
Total Cost, Net of Accumulated Depreciation	$ 29,589
Year of Completion/Acquisition	N/A

[1] Lease-up/development communities may include costs included under buildings and improvements on the balance sheet as of December 31, 2011.

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Postretirement Benefits (Postretirement Benefits Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Postretirement Benefits [Abstract]
Interest Cost	$ 177	$ 174	$ 181
Amortization of prior service cost	16
Net periodic benefit cost	$ 193	$ 174	$ 181

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Notes Payable (Scheduled Repayments On Outstanding Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Debt Instrument [Line Items]
2012	$ 294.2
2013	228.0
2014	11.0
2015	252.4
2016	2.6	[1]
2017 and thereafter	1,643.9
Total notes payable	$ 2,432.1
Weighted Average Interest Rate	4.80%
Maturities Due In 2012 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.20%
Maturities Due In 2013 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.40%
Maturities Due In 2014 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.00%
Maturities Due In 2015 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.10%
Maturities Due In 2016 And Thereafter [Member]
Debt Instrument [Line Items]
2017 and thereafter, Weighted Average Interest Rate	4.60%

[1] Includes only scheduled principal amortizations.

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Postretirement Benefits (Estimated Benefit Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Postretirement Benefits [Abstract]
2012	$ 228
2013	233
2014	239
2015	244
2016	245
2017-2021	1,273
Total	$ 2,462

XML

Schedule III - Real Estate And Accumulated Depreciation (Changes In Accumulated Depreciation) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule III - Real Estate And Accumulated Depreciation [Abstract]
Balance, Beginning of period	$ 1,292,924,000	$ 1,149,056,000	$ 981,049,000
Depreciation	171,009,000	166,867,000	170,480,000
Real Estate sold	(18,877,000)	(22,999,000)	(2,473,000)
Transferred to held for sale	(12,257,000)
Balance, end of period	1,432,799,000	1,292,924,000	1,149,056,000
Aggregate cost for federal income tax purposes		$ 5,000,000,000

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Noncontrolling Interests (Effect Of Changes In Ownership Interest In Subsidiaries) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Noncontrolling Interests [Abstract]
Net income (loss) attributable to common shareholders	$ 46,850	$ 11,840	$ (16,597)	$ 7,286	$ 17,147	$ 1,650	$ 2,134	$ 2,285	$ 49,379	[1]	$ 23,216	[1]	$ (50,800)
Increase in equity for conversion of operating partnership units									592		3,528		3,761
Increase in equity from purchase of noncontrolling interests													647
Change in common equity and net transfers from noncontrolling interests									$ 49,971		$ 26,744		$ (46,392)

[1] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

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Postretirement Benefits (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Office space	$ 200,000	$ 200,000
Increase in per capita health care cost rate		7.80%
Health care claims annual rate after 2024		4.50%
Accumulated postretirement benefit obligation discount rate		4.50%	6.10%
Net periodic benefit cost discount rate		5.25%	6.10%	6.29%
Number of former officers of summit		2
Defined benefit plan effect of 1% increase (decrease) on service and interest cost components		0
Increase or decrease accumulated postretirement benefit obligation		100,000
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to medical benefit		1,260
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to medical benefit		$ 540
Net Periodic Postretirement Benefit Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase or decrease in health care cost trend rates		1.00%
Accumulated Postretirement Benefit Obligation [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase or decrease in health care cost trend rates		1.00%

XML

Schedule III - Real Estate And Accumulated Depreciation

12 Months Ended

Dec. 31, 2011

Schedule III - Real Estate And Accumulated Depreciation [Abstract]

Schedule III - Real Estate And Accumulated Depreciation

Schedule III

Camden Property Trust

Real Estate and Accumulated Depreciation

As of December 31, 2011

(in thousands)

		00000		00000		00000		00000		00000		00000		00000		00000		00000		00000
	Initial Cost						Total Cost
	Land		Building/ Construction  in Progress & Improvements		Cost Subsequent to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Current communities:
Camden Ashburn Farm	$	4,835	$	22,604	$	730	$	4,835	$	23,334	$	28,169	$	5,079	$	23,090	$			2005
Camden Aventura		12,185		47,616		3,908		12,185		51,524		63,709		10,911		52,798		34,145		2005
Camden Ballantyne		4,503		30,250		3,020		4,503		33,270		37,773		6,998		30,775		26,025		2005
Camden Bay		7,450		63,283		5,371		7,450		68,654		76,104		22,815		53,289				1998/2002
Camden Bay Pointe		1,296		10,394		6,042		1,296		16,436		17,732		10,600		7,132				1997
Camden Bayside		3,726		28,689		13,525		3,726		42,214		45,940		23,480		22,460				1997
Camden Baytown		520		13,071		2,026		520		15,097		15,617		6,337		9,280				1999
Camden Bel Air		3,594		31,221		4,731		3,594		35,952		39,546		17,975		21,571				1998
Camden Breakers		1,055		13,024		3,802		1,055		16,826		17,881		8,395		9,486				1996
Camden Breeze		2,894		15,828		3,579		2,894		19,407		22,301		9,452		12,849				1998
Camden Brickell		14,621		57,031		3,586		14,621		60,617		75,238		13,415		61,823				2005
Camden Brookwood		7,174		31,984		1,907		7,174		33,891		41,065		7,665		33,400		22,624		2005
Camden Buckingham		2,704		21,251		2,677		2,704		23,928		26,632		10,452		16,180				1997
Camden Caley		2,047		17,445		1,577		2,047		19,022		21,069		7,385		13,684		15,352		2000
Camden Canyon		1,802		11,666		4,556		1,802		16,222		18,024		7,800		10,224				1998
Camden Cedar Hills		2,684		20,931		15		2,684		20,946		23,630		3,445		20,185				2008
Camden Centennial		3,123		13,051		2,851		3,123		15,902		19,025		7,589		11,436				1995
Camden Centre		172		1,166		255		172		1,421		1,593		733		860				1998
Camden Centreport		1,613		12,644		1,827		1,613		14,471		16,084		6,486		9,598				1997
Camden Cimarron		2,231		14,092		2,811		2,231		16,903		19,134		8,630		10,504				1997
Camden Citrus Park		1,144		6,045		3,846		1,144		9,891		11,035		6,274		4,761				1997
Camden City Centre		4,976		44,735		146		4,976		44,881		49,857		7,861		41,996		33,795		2007
Camden Clearbrook		2,384		44,017		98		2,384		44,115		46,499		7,875		38,624				2007
Camden Club		4,453		29,811		7,100		4,453		36,911		41,364		21,164		20,200				1998
Camden College Park		16,409		91,503		39		16,409		91,542		107,951		3,209		104,742				2008
Camden Commons		2,476		20,073		5,023		2,476		25,096		27,572		14,332		13,240				1998
Camden Copper Ridge		1,204		9,180		4,824		1,204		14,004		15,208		9,450		5,758				1993
Camden Copper Square		4,825		23,672		2,434		4,825		26,106		30,931		10,133		20,798				2000
Camden Cotton Mills		4,246		19,147		2,059		4,246		21,206		25,452		4,783		20,669				2005
Camden Cove		1,382		6,266		1,397		1,382		7,663		9,045		4,199		4,846				1998
Camden Creek		1,494		12,483		5,532		1,494		18,015		19,509		13,157		6,352				1993
Camden Crest		4,412		33,366		1,724		4,412		35,090		39,502		7,669		31,833				2005
Camden Crown Valley		9,381		54,210		2,006		9,381		56,216		65,597		18,672		46,925				2001
Camden Deerfield		4,895		21,922		1,248		4,895		23,170		28,065		5,359		22,706		19,220		2005
Camden Del Mar		4,404		35,264		13,123		4,404		48,387		52,791		23,180		29,611				1998
Camden Dilworth		516		16,633		129		516		16,762		17,278		3,403		13,875		13,073		2006
Camden Doral		10,260		40,416		1,109		10,260		41,525		51,785		8,877		42,908		26,825		2005
Camden Doral Villas		6,476		25,543		1,507		6,476		27,050		33,526		6,055		27,471				2005
Camden Dulles Station		10,807		61,548		111		10,807		61,659		72,466		8,169		64,297				2008
Camden Dunwoody		5,290		23,642		1,767		5,290		25,409		30,699		5,665		25,034		21,168		2005
Camden Fair Lakes		15,515		104,223		3,100		15,515		107,323		122,838		22,104		100,734				2005

		00000		00000		00000		00000		00000		00000		00000		00000		00000		00000
	Initial Cost						Total Cost
	Land		Building/ Construction  in Progress & Improvements		Cost Subsequent to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Camden Fairfax Corner	$	8,484	$	72,953	$	212	$	8,484	$	73,165	$	81,649	$	14,428	$	67,221	$			2006
Camden Fairview		1,283		7,223		1,411		1,283		8,634		9,917		2,220		7,697				2005
Camden Fairways		3,969		15,543		8,621		3,969		24,164		28,133		12,909		15,224				1998
Camden Fallsgrove		9,408		43,647		923		9,408		44,570		53,978		9,508		44,470				2005
Camden Farmers Market		17,341		74,193		3,706		17,341		77,899		95,240		25,036		70,204		50,711		2001/2005
Camden Forest		970		7,209		2,521		970		9,730		10,700		5,720		4,980				1997
Camden Foxcroft		1,408		7,919		2,472		1,408		10,391		11,799		2,736		9,063		9,040		2005
Camden Gaines Ranch		5,094		37,100		2,593		5,094		39,693		44,787		8,055		36,732				2005
Camden Gardens		1,500		6,137		2,892		1,500		9,029		10,529		6,310		4,219				1994
Camden Glen Lakes		2,157		16,339		13,076		2,157		29,415		31,572		22,952		8,620				1993
Camden Governor's Village		3,669		20,508		1,486		3,669		21,994		25,663		5,084		20,579		13,004		2005
Camden Grand Parc		7,688		35,900		669		7,688		36,569		44,257		7,715		36,542				2005
Camden Grandview		7,570		33,859		3,410		7,570		37,269		44,839		8,396		36,443				2005
Camden Greenway		16,916		43,933		4,901		16,916		48,834		65,750		20,160		45,590		52,359		1999
Camden Habersham		1,004		10,283		2,941		1,004		13,224		14,228		8,254		5,974				1997
Camden Harbor View		16,079		127,459		2,038		16,079		129,497		145,576		33,131		112,445		92,716		2003
Camden Highlands Ridge		2,612		34,726		3,813		2,612		38,539		41,151		15,216		25,935				1996
Camden Hills		853		7,834		1,351		853		9,185		10,038		4,863		5,175				1998
Camden Hunter's Creek		4,156		20,925		1,088		4,156		22,013		26,169		5,013		21,156				2005
Camden Huntingdon		2,289		17,393		2,958		2,289		20,351		22,640		10,779		11,861				1995
Camden Interlocken		5,293		31,612		4,124		5,293		35,736		41,029		14,171		26,858		27,431		1999
Camden Lago Vista		3,497		29,623		437		3,497		30,060		33,557		7,481		26,076				2005
Camden Lake Pine		5,746		31,714		2,763		5,746		34,477		40,223		7,897		32,326		26,212		2005
Camden Lakes		3,106		22,746		10,630		3,106		33,376		36,482		22,085		14,397				1997
Camden Lakeside		1,171		7,395		4,027		1,171		11,422		12,593		7,093		5,500				1997
Camden Lakeway		3,915		34,129		4,449		3,915		38,578		42,493		16,637		25,856		29,267		1997
Camden Landings		1,045		6,434		3,786		1,045		10,220		11,265		6,649		4,616				1997
Camden Landsdowne		15,502		102,267		2,343		15,502		104,610		120,112		22,634		97,478				2005
Camden Largo Town Center		8,411		44,163		1,301		8,411		45,464		53,875		9,390		44,485				2005
Camden Las Olas		12,395		79,518		1,678		12,395		81,196		93,591		17,690		75,901				2005
Camden Laurel Ridge		915		4,338		2,436		915		6,774		7,689		4,510		3,179				1994
Camden Lee Vista		4,350		34,643		3,463		4,350		38,106		42,456		13,881		28,575				2000
Camden Legacy		4,068		26,612		4,423		4,068		31,035		35,103		14,713		20,390				1998
Camden Legacy Creek		2,052		12,896		2,267		2,052		15,163		17,215		7,117		10,098				1997
Camden Legacy Park		2,560		15,449		2,840		2,560		18,289		20,849		8,281		12,568		13,866		1997
Camden Legends		1,370		6,382		917		1,370		7,299		8,669		3,507		5,162				1998
Camden Live Oaks		6,428		39,127		13,373		6,428		52,500		58,928		26,984		31,944				1998
Camden Main & Jamboree		17,363		75,387		20		17,363		75,407		92,770		3,602		89,168		52,130		2008
Camden Manor Park		2,535		47,159		349		2,535		47,508		50,043		10,225		39,818		29,675		2006
Camden Martinique		28,401		51,861		10,747		28,401		62,608		91,009		26,928		64,081		39,061		1998
Camden Midtown		4,583		18,026		3,273		4,583		21,299		25,882		8,776		17,106		28,058		1999
Camden Midtown Atlanta		6,196		33,828		2,107		6,196		35,935		42,131		8,335		33,796		20,565		2005
Camden Miramar		—		31,655		6,430		—		38,085		38,085		13,906		24,179				1994-2011
Camden Monument Place		9,030		54,089		47		9,030		54,136		63,166		9,101		54,065				2007

		00000		00000		00000		00000		00000		00000		00000		00000		00000		00000
	Initial Cost						Total Cost
	Land		Building/ Construction  in Progress & Improvements		Cost Subsequent to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Camden Oak Crest	$	2,078	$	20,941	$	1,051	$	2,078	$	21,992	$	24,070	$	7,061	$	17,009	$	17,309		2003
Camden Old Creek		20,360		71,777		203		20,360		71,980		92,340		12,622		79,718				2007
Camden Orange Court		5,319		40,733		63		5,319		40,796		46,115		5,907		40,208				2008
Camden Overlook		4,591		25,563		2,606		4,591		28,169		32,760		6,707		26,053		19,546		2005
Camden Palisades		8,406		31,497		7,080		8,406		38,577		46,983		18,074		28,909				1998
Camden Park Commons		1,146		11,311		1,916		1,146		13,227		14,373		6,351		8,022				1997
Camden Peachtree City		6,536		29,063		1,637		6,536		30,700		37,236		7,203		30,033				2005
Camden Pinehurst		3,380		14,807		6,568		3,380		21,375		24,755		19,715		5,040				1997
Camden Pinnacle		1,640		12,287		2,508		1,640		14,795		16,435		7,195		9,240				1994
Camden Plantation		6,299		77,964		4,270		6,299		82,234		88,533		17,357		71,176				2005
Camden Plaza		7,204		31,044		95		7,204		31,139		38,343		1,170		37,173		22,214		2007
Camden Pointe		2,058		14,879		2,274		2,058		17,153		19,211		7,836		11,375				1998
Camden Portofino		9,867		38,702		2,300		9,867		41,002		50,869		8,701		42,168				2005
Camden Potomac Yard		16,498		88,317		51		16,498		88,368		104,866		13,075		91,791				2008
Camden Preserve		1,206		17,982		2,536		1,206		20,518		21,724		8,411		13,313				1997
Camden Providence Lakes		2,020		14,855		4,723		2,020		19,578		21,598		6,740		14,858				2002
Camden Renaissance		4,144		39,987		3,763		4,144		43,750		47,894		16,949		30,945				1997
Camden Reserve		3,910		20,027		7,438		3,910		27,465		31,375		15,300		16,075				1997
Camden Reunion Park		3,302		18,457		1,661		3,302		20,118		23,420		4,680		18,740		19,961		2005
Camden Ridgecrest		1,008		12,720		2,528		1,008		15,248		16,256		7,970		8,286				1995
Camden River		5,386		24,025		2,863		5,386		26,888		32,274		6,344		25,930		21,614		2005
Camden Roosevelt		11,470		45,785		481		11,470		46,266		57,736		10,103		47,633				2005
Camden Royal Oaks		1,055		20,046		160		1,055		20,206		21,261		4,780		16,481				2006
Camden Royal Palms		2,147		38,339		788		2,147		39,127		41,274		6,065		35,209				2007
Camden Russett		13,460		61,837		2,101		13,460		63,938		77,398		13,632		63,766		45,063		2005
Camden San Paloma		6,480		23,045		3,139		6,480		26,184		32,664		8,237		24,427				2002
Camden Sea Palms		4,336		9,930		2,157		4,336		12,087		16,423		5,679		10,744				1998
Camden Sedgebrook		5,266		29,211		2,049		5,266		31,260		36,526		6,930		29,596		21,306		2005
Camden Shiloh		4,181		18,798		1,089		4,181		19,887		24,068		4,817		19,251		10,576		2005
Camden Sierra at Otay		10,585		49,781		1,436		10,585		51,217		61,802		13,779		48,023				2003
Camden Silo Creek		9,707		45,144		734		9,707		45,878		55,585		9,716		45,869				2005
Camden Simsbury		1,152		6,499		994		1,152		7,493		8,645		1,607		7,038				2005
Camden South End Square		6,625		29,175		1,438		6,625		30,613		37,238		6,913		30,325				2005
Camden Springs		1,520		8,300		3,791		1,520		12,091		13,611		9,444		4,167				1994
Camden St. Clair		7,526		27,486		2,252		7,526		29,738		37,264		6,567		30,697		21,646		2005
Camden Steeplechase		1,089		5,190		4,621		1,089		9,811		10,900		7,431		3,469				1994
Camden Stockbridge		5,071		22,693		1,183		5,071		23,876		28,947		5,746		23,201		14,332		2005
Camden Stonebridge		1,016		7,137		2,527		1,016		9,664		10,680		5,582		5,098				1993
Camden Stonecrest		3,954		22,021		2,117		3,954		24,138		28,092		5,289		22,803		16,920		2005
Camden Stoneleigh		3,498		31,285		1,670		3,498		32,955		36,453		6,276		30,177				2006
Camden Summerfield		14,659		48,404		141		14,659		48,545		63,204		7,486		55,718				2008
Camden Sweetwater		4,395		19,664		1,381		4,395		21,045		25,440		5,054		20,386				2005
Camden Touchstone		1,203		6,772		1,928		1,203		8,700		9,903		2,411		7,492				2005
Camden Travis Street		1,780		29,104		44		1,780		29,148		30,928		2,852		28,076		31,476		2010

		00000		00000		00000		00000		00000		00000		00000		00000		00000		00000
	Initial Cost						Total Cost
	Land		Building/ Construction  in Progress & Improvements		Cost Subsequent to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Camden Tuscany	$	3,330	$	36,466	$	698	$	3,330	$	37,164	$	40,494	$	9,859	$	30,635	$			2003
Camden Valley Park		3,096		14,667		11,947		3,096		26,614		29,710		19,016		10,694				1994
Camden Valleybrook		7,340		39,139		1,322		7,340		40,461		47,801		9,010		38,791				2005
Camden Vanderbilt		16,076		44,918		12,642		16,076		57,560		73,636		28,224		45,412		73,165		1994/1997
Camden Vineyards		4,367		28,494		1,085		4,367		29,579		33,946		8,965		24,981				2002
Camden Vintage		3,641		19,255		4,334		3,641		23,589		27,230		12,328		14,902				1998
Camden Westshore		1,734		10,819		5,869		1,734		16,688		18,422		9,845		8,577				1997
Camden Westview		1,031		7,932		4,172		1,031		12,104		13,135		8,224		4,911				1993
Camden Westwood		4,567		25,519		1,417		4,567		26,936		31,503		6,042		25,461		19,907		2005
Camden Whispering Oaks		1,188		26,242		70		1,188		26,312		27,500		4,162		23,338				2008
Camden Woods		2,693		19,930		8,012		2,693		27,942		30,635		16,448		14,187				1999
Camden World Gateway		5,785		51,821		1,598		5,785		53,419		59,204		10,856		48,348				2005
Total Current communities(1):		754,941		4,270,862		427,951		754,941		4,698,813		5,453,754		1,432,053		4,021,701		1,051,357

(1) Current communities may include costs included in properties under development on the balance sheet as of December 31, 2011.

		00000		00000		00000		00000		00000		00000		00000		00000		00000		00000
	Initial Cost						Total Cost
	Land		Building/ Construction in Progress & Improvements		Cost Subsequent  to Acquisition/ Construction		Land		Building/ Construction in Progress & Improvements		Total		Accumulated Depreciation		Total Cost, Net of Accumulated Depreciation		Encumbrances		Year of Completion/ Acquisition
Lease-up & Construction communities:
Camden LaVina	$	12,907	$	41,852	$	—	$	12,907	$	41,852	$	54,759	$	511	$	54,248	$			N/A
Camden Summerfield II		4,459		19,840		—		4,459		19,840		24,299		150		24,149				N/A
Total Lease-up construction communities (2):		17,366		61,692		—		17,366		61,692		79,058		661		78,397		—
Communities under construction:
Camden City Centre II				10,148		—				10,148		10,148		—		10,148				N/A
Camden Montague				13,364		—				13,364		13,364		2		13,362				N/A
Camden NOMA				39,022		—				39,022		39,022		2		39,020				N/A
Camden Royal Oaks II				11,085		—				11,085		11,085		13		11,072				N/A
Camden Town Square				28,653		—				28,653		28,653		—		28,653				N/A
Camden Westchase Park				29,590		—				29,590		29,590		1		29,589				N/A
Total Construction communities (2):		—		131,862		—		—		131,862		131,862		18		131,844		—
Total Development Pipeline and Land Holdings (2)		—		151,576		—		—		151,576		151,576		67		151,509		—		N/A
Corporate		—		3,290		—		—		3,290		3,290		—		3,290		—		N/A
	$	17,366	$	348,420		—		17,366	$	348,420	$	365,786	$	746	$	365,040		—
TOTAL	$	772,307	$	4,619,282	$	427,951	$	772,307	$	5,047,233	$	5,819,540	$	1,432,799	$	4,386,741	$	1,051,357

(2) Lease-up/development communities may include costs included under buildings and improvements on the balance sheet as of December 31, 2011.

The changes in total real estate assets for the years ended December 31:

		September 30,			September 30,			September 30,
	2011			2010			2009
Balance, beginning of period	$	5,647,677		$	5,461,626		$	5,455,834
Additions during period:
Acquisition		—			238,885			—
Development		180,028			21,798			36,495
Improvements		61,037			44,405			35,377
Classification from held for sale		—			—			9,518
Deductions during period:
Cost of real estate sold contributed to joint venture		(12,578	)		(119,037	)		(3,345	)
Cost of real estate sold – other		(32,673	)		—			—
Impairment		—			—			(72,253	)
Classification to held for sale		(23,951	)		—			—
Balance, end of period	$	5,819,540		$	5,647,677		$	5,461,626
The changes in accumulated depreciation for the years ended December 31:
	2011			2010			2009
Balance, Beginning of period	$	1,292,924		$	1,149,056		$	981,049
Depreciation		171,009			166,867			170,480
Real Estate sold		(18,877	)		(22,999	)		(2,473	)
Transferred to held for sale		(12,257	)		—			—
Balance, end of period	$	1,432,799		$	1,292,924		$	1,149,056

The aggregate cost for federal income tax purposes at December 31, 2011 was $5.0 billion.

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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended		12 Months Ended					1 Months Ended				12 Months Ended	1 Months Ended					1 Months Ended	12 Months Ended
	Jan. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Glendale, California [Member] A	Dec. 31, 2011 Atlanta, Georgia [Member] A	Aug. 31, 2010 Irvine, California [Member]	Aug. 31, 2010 Irvine, California [Member] Joint Venture Note Payable [Member]	Dec. 31, 2010 Houston, Texas And College Park, Maryland [Member]	Dec. 31, 2010 Houston, Texas And College Park, Maryland [Member] Joint Venture Note Payable [Member]	Dec. 31, 2010 Houston, Texas And College Park, Maryland [Member] Joint Venture Note Payable [Member]	Dec. 31, 2010 Houston, Texas And College Park, Maryland [Member] Joint Venture Note Payable And Third Party [Member]	Aug. 31, 2010 Previous Ownership Percentage [Member] Irvine, California [Member]	Dec. 31, 2010 Previous Ownership Percentage [Member] Houston, Texas And College Park, Maryland [Member]	Aug. 31, 2010 New Ownership Percentage [Member] Irvine, California [Member]	Dec. 31, 2010 New Ownership Percentage [Member] Houston, Texas And College Park, Maryland [Member]	Jan. 31, 2012 Discontinued Operation or Asset Disposal [Member]	Dec. 31, 2011 Discontinued Operation or Asset Disposal [Member]	Dec. 31, 2010 Discontinued Operation or Asset Disposal [Member]	Dec. 31, 2009 Discontinued Operation or Asset Disposal [Member]
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Line Items]
Acres of land acquired							2.2	30.1
Acquisitions of land							$ 21,400,000	$ 40,100,000
Number of joint ventures restructured					3				1		2
Equity method investment previous ownership percentage															30.00%	30.00%
Equity method investment new ownership percentage																	99.99%	99.99%
Increase in real estate assets									92,700,000		146,200,000
Reduction to investments in joint ventures									21,200,000		2,400,000
Decrease in notes receivable - affiliates									20,700,000		14,300,000
Secured note, basis spread on variable rate										2.25%		2.00%	2.00%
Term of secured credit agreement, years										35
Proceeds from secured credit agreement		1,051,357,000	1,055,997,000	1,051,357,000	1,055,997,000					53,000,000		22,600,000	22,600,000
Assumed debt of the joint venture												27,200,000
Secured notes payable		1,051,357,000	1,055,997,000	1,051,357,000	1,055,997,000					53,000,000		22,600,000	22,600,000
Repayments of assumed debt of joint venture										52,100,000		4,600,000		108,800,000
Notes payable, maturity date													May 2019
Effective annual interest rate on secured credit										4.35%		5.33%	5.33%
Contributed revenue					2,600,000
Business Combination Pro Forma Information Operating Income Since Acquisition Date Actual					1,500,000
Previously acquired joint venture operating income contributed in current year				12,600,000
Previously acquired joint venture revenues contributed in current year				20,800,000
Number of operating properties sold	1	4																		2	2	1
Number of apartment homes sold																			357	788
Proceeds from the sale of property held for sale																			24,500,000
Impairment associated with land development activities						72,253,000
Costs capitalized and exit costs associated with land development joint venture						13,400,000
Impairment on technology investment			$ 1,000,000

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Summary Of Significant Accounting Policies And Recent Accounting Pronouncements (Expected Useful Lives Of Depreciable Property) (Details)	12 Months Ended
	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Intangible assets (in-place leases and above and below market leases)	underlying lease term
Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Minimum Estimated Useful Life (in years)	5
Maximum Estimated Useful Life (in years)	35
Furniture, Fixtures, Equipment, And Other [Member]
Property, Plant and Equipment [Line Items]
Minimum Estimated Useful Life (in years)	3
Maximum Estimated Useful Life (in years)	20

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Postretirement Benefits (Postretirement Benefits Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Postretirement Benefits [Abstract]
Accumulated other comprehensive income, beginning of year	$ 201		$ 136
Prior service cost arising during period	(291)
Amortization of prior service cost	16
Net actuarial gain (loss) arising during period	(609)	65
Accumulated other comprehensive income (loss), end of year	$ (683)		$ 136

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Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2011

Postretirement Benefits [Abstract]

Change In Benefit Obligation Benefit Plans

		September 30,			September 30,
(in thousands)	2011			2010
Postretirement benefit obligation, beginning of year	$	2,844		$	2,949
Net periodic benefit cost		193			174
Actuarial (gain) loss		609			(65	)
Prior service cost		291			—
Amortization of prior service cost		(16	)		—
Benefits paid		(220	)		(214	)
Accumulated postretirement benefit obligation, end of year	$	3,701		$	2,844

Postretirement Benefits Net Periodic Benefit Cost

		September 30,		September 30,		September 30,
(in thousands)	2011		2010		2009
Interest cost	$	177	$	174	$	181
Amortization of prior service cost		16		—		—
Total net periodic benefit cost	$	193	$	174	$	181

Postretirement Benefits Change In Plan Assets

		September 30,			September 30,
(in thousands)	2011			2010
Fair value of plan assets at end of prior year	$	—		$	—
Employer contributions		220			214
Benefits paid		(220	)		(214	)
Fair value of plan assets at end of year	$	—		$	—

Postretirement Benefits Accumulated Other Comprehensive Income

		September 30,			September 30,
(in thousands)	2011			2010
Accumulated other comprehensive income, beginning of year	$	201		$	136
Prior service cost arising during period		(291	)		—
Amortization of prior service cost		16			—
Net actuarial gain (loss) arising during period		(609	)		65
Accumulated other comprehensive income (loss), end of year	$	(683	)	$	201

Estimated Benefit Payments

		September 30,
(in thousands) Year Beginning January 1	Estimated Benefit Payment
2012	$	228
2013		233
2014		239
2015		244
2016		245
2017-2021		1,273
Total	$	2,462

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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Summary Of Income From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property Acquisitions Discontinued Operation And Assets Held For Sale [Abstract]
Property revenues			$ 9,206	$ 19,728	$ 23,686
Property expenses			4,696	9,170	10,335
Operating income			4,510	10,558	13,351
Depreciation and amortization			2,298	5,198	5,837
Income from discontinued operations			2,212	5,360	7,514
Gain on sale of discontinued operations, net of tax	$ 24,621	$ 9,614	$ 24,621	$ 9,614	$ 16,887

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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan investments	$ 41.0	$ 46.7
Available-for-sale investment		5.0
Derivative financial instruments, Assets	0.1
Derivative financial instruments, Liabilities	16.6	36.9
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan investments	41.0	46.7
Available-for-sale investment		5.0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial instruments, Assets	0.1
Derivative financial instruments, Liabilities	$ 16.6	$ 36.9

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Derivative Instruments And Hedging Activities (Effect Of Derivative Financial Instruments On The Statements Of Income And Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Cash Flow Hedge [Member] | Loss On Discontinuation Of Hedging Relationship [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in Income on Derivative (Discontinuation, Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 29.8	[1]		[1]
Cash Flow Hedge [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)	9.9	[1]	23.4	[1]	22.2	[1]
Interest Rate Cap [Member] | Other Income/(Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Income on Derivative
Interest Rate Cap [Member] | Not-Designated [Member] | Other Income/(Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Income on Derivative	(0.1)
Interest Rate Swaps [Member] | Other Income/(Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Income on Derivative
Interest Rate Swaps [Member] | Cash Flow Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative (Effective Portion)	(2.7)	[1]	(19.1)	[1]	(12.3)	[1]
Interest Rate Swaps [Member] | Not-Designated [Member] | Other Income/(Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Income on Derivative	$ (0.2)

[1] The results include the interest rate swap gain (loss) prior to discontinuation in May 2011.

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Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Annual dividends distribution percentage to shareholders to qualify as a REIT	90.00%
Income tax related to gain on sale of available-for-sale investments	$ 1,000,000
REIT subsidiaries net operating loss carryforwards	29,000,000
Operating loss carry forwards expiration dates	2011, our taxable REIT subsidiaries had
Difference between carrying value of net asset and tax basis of net asset	972,800,000
Income tax expense - current	$ 2,220,000	$ 1,581,000	$ 967,000

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Summary Of Significant Accounting Policies And Recent Accounting Pronouncements

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Abstract]

Summary Of Significant Accounting Policies And Recent Accounting Pronouncements

2. Summary of Significant Accounting Policies and Recent Accounting Pronouncements

Principles of Consolidation. Our consolidated financial statements include our accounts and the accounts of other subsidiaries and joint ventures (including partnerships and limited liability companies) over which we have control. All intercompany transactions, balances, and profits have been eliminated in consolidation. Investments acquired or created are continuously evaluated based on the accounting guidance relating to variable interest entities ("VIEs"), which requires the consolidation of VIEs in which we are considered to be the primary beneficiary. If the investment is determined not to be a VIE, then the investment is evaluated for consolidation (primarily using a voting interest model) under the remaining consolidation guidance relating to real estate entities. If we are the general partner of a limited partnership, or manager of a limited liability company, we also consider the consolidation guidance relating to the rights of limited partners (non-managing members) to assess whether any rights held by the limited partners overcome the presumption of control by us.

Allocations of Purchase Price. Upon the acquisition of real estate, we allocate the purchase price between tangible and intangible assets, which includes land, buildings, furniture and fixtures, the value of in-place leases, including above and below market leases, and acquired liabilities. When allocating the purchase price to acquired properties, we allocate costs to the estimated intangible value of in-place leases and above or below market leases and to the estimated fair value of furniture and fixtures, land, and buildings on a value determined by assuming the property was vacant by applying methods similar to those used by independent appraisers of income-producing property. Depreciation is computed on a straight-line basis over the remaining useful lives of the related tangible assets. The value of in-place leases and above or below market leases is amortized over the estimated average remaining life of leases in place at the time of acquisition. There was no unamortized value of in-place leases at December 31, 2011. The unamortized value of in-place leases at December 31, 2010 was approximately $3.9 million. Estimates of fair value of acquired debt are based upon interest rates available for the issuance of debt with similar terms and remaining maturities.

Asset Impairment. Long-lived assets are reviewed for impairment annually or whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Impairment exists if estimated future undiscounted cash flows associated with long-lived assets are not sufficient to recover the carrying value of such assets. We consider projected future discounted and undiscounted cash flows, trends, strategic decisions regarding future development plans, and other factors in our assessment of whether impairment conditions exist. When impairment exists, the long-lived asset is adjusted to its fair value. While we believe our estimates of future cash flows are reasonable, different assumptions regarding a number of factors, including market rents, economic conditions, and occupancies could significantly affect these estimates. In estimating fair value, management uses appraisals, management estimates, and discounted cash flow calculations which maximize inputs from a marketplace participant's perspective.

In addition, we evaluate our equity investments in joint ventures and if we believe there is an other than temporary decline in market value of our investment, we will record an impairment charge.

The value of our properties under development depends on market conditions, including estimates of the project start date as well as estimates of demand for multifamily communities. We have reviewed market trends and other marketplace information and have incorporated this information as well as our current outlook into the assumptions we use in our impairment analyses. Due to the judgment and assumptions applied in the impairment analyses, it is possible actual results could differ substantially from those estimated.

We believe the carrying value of our operating real estate assets, properties under development, and land is currently recoverable. However, if market conditions deteriorate or if changes in our development strategy significantly affect any key assumptions used in our fair value calculations, we may need to take material charges in future periods for impairments related to existing assets. Any such material non-cash charges could have an adverse effect on our consolidated financial position and results of operations.

Cash and Cash Equivalents. All cash and investments in money market accounts and other highly liquid securities with a maturity of three months or less at the date of purchase are considered to be cash and cash equivalents. We maintain the majority of our cash and cash equivalents at major financial institutions in the United States and deposits with these financial institutions may exceed the amount of insurance provided on such deposits; however, we regularly monitor the financial stability of these financial institutions and believe we are not currently exposed to any significant default risk with respect to these deposits.

Cost Capitalization. Real estate assets are carried at cost plus capitalized carrying charges. Carrying charges are primarily interest and real estate taxes which are capitalized as part of properties under development. Capitalized interest is generally based on the weighted average interest rate of our unsecured debt. Transaction costs associated with the acquisition of operating real estate assets are expensed. Expenditures directly related to the development and improvement of real estate assets are capitalized at cost as land and buildings and improvements. Indirect development costs, including salaries and benefits and other related costs directly attributable to the development of properties are also capitalized. All construction and carrying costs are capitalized and reported in the balance sheet as properties under development until the apartment homes are substantially completed. Upon substantial completion of the apartment homes, the total capitalized development cost for the apartment homes and the associated land is transferred to buildings and improvements and land, respectively.

As discussed above, carrying charges are principally interest and real estate taxes capitalized as part of properties under development. Capitalized interest was approximately $8.8 million, $5.7 million, and $10.3 million for the years ended December 31, 2011, 2010, and 2009, respectively. Capitalized real estate taxes were approximately $1.4 million, $0.8 million, and $1.9 million for the years ended December 31, 2011, 2010, and 2009, respectively.

Where possible, we stage our construction to allow leasing and occupancy during the construction period, which we believe minimizes the duration of the lease-up period following completion of construction. Our accounting policy related to properties in the development and leasing phase is to expense all operating expenses associated with completed apartment homes. We capitalize renovation and improvement costs we believe extend the economic lives of depreciable property. Capital expenditures subsequent to initial construction are capitalized and depreciated over their estimated useful lives.

Depreciation and amortization is computed over the expected useful lives of depreciable property on a straight-line basis with lives generally as follows:

		September 30,
	Estimated Useful  Life
Buildings and improvements		5-35 years
Furniture, fixtures, equipment and other		3-20 years
Intangible assets (in-place leases and above and below market leases)		underlying lease term

Derivative Financial Instruments. Derivative financial instruments are recorded in the consolidated balance sheets at fair value and we do not apply master netting for financial reporting purposes. Accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows or other types of forecasted transactions are cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes attributable to the earnings effect of the hedged transactions. We may enter into derivative contracts which are intended to economically hedge certain of our risks, for which hedge accounting does not apply or we elect not to apply hedge accounting.

Discontinued Operations. A property is classified as a discontinued operation when (i) the operations and cash flows of the property can be clearly distinguished and have been or will be eliminated from our ongoing operations; (ii) the property has either been disposed of or is classified as held for sale; and (iii) we will not have any significant continuing involvement in the operations of the property after the disposal transactions. Significant judgments are involved in determining whether a property meets the criteria for discontinued operations reporting and the period in which these criteria are met. A property is classified as held for sale when (i) management commits to a plan to sell and it is actively marketed; (ii) it is available for immediate sale in its present condition and the sale is expected to be completed within one year; and (iii) it is unlikely significant changes to the plan will be made or the plan will be withdrawn.

The results of operations for properties sold during the period or classified as held for sale at the end of the current period are classified as discontinued operations in the current and prior periods. The property-specific components of earnings classified as discontinued operations include separately identifiable property-specific revenues, expenses, depreciation, and interest expense, if any. The gain or loss resulting from the eventual disposal of the held for sale properties is also classified within discontinued operations. Real estate assets held for sale are measured at the lower of carrying amount or fair value less costs to sell and are presented separately in the accompanying consolidated balance sheets. Subsequent to classification of a property as held for sale, no further depreciation is recorded. Properties sold by our unconsolidated entities are not included in discontinued operations and related gains or losses are reported as a component of equity in income (loss) of joint ventures.

Gains on sale of real estate are recognized using the full accrual or partial sale methods, as applicable, in accordance with accounting principles generally accepted in the United States of America ("GAAP"), provided various criteria relating to the terms of sale and any subsequent involvement with the real estate sold are met.

Fair Value. For financial assets and liabilities recorded at fair value on a recurring basis, fair value is the price we would receive to sell an asset, or pay to transfer a liability, in an orderly transaction with a market participant at the measurement date. In the absence of such data, fair value is estimated using internal information consistent with what market participants would use in a hypothetical transaction.

In determining fair value, observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions; preference is given to observable inputs. These two types of inputs create the following fair value hierarchy:

• Level 1: Quoted prices for identical instruments in active markets.

• Level 2: Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.

• Level 3: Significant inputs to the valuation model are unobservable.

The following describes the valuation methodologies we use to measure different financial instruments at fair value on a recurring basis:

 

Deferred Compensation Plan Investments. The estimated fair values of investment securities classified as deferred compensation plan investments are based on quoted market prices utilizing public information for the same transactions. Our deferred compensation plan investments are recorded in other assets in our consolidated balance sheets.

Derivative Financial Instruments. The estimated fair values of derivative financial instruments are valued using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and volatility. The fair values of interest rate swaps and caps are estimated using the market standard methodology of netting the discounted fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of interest rates (forward curves) derived from observable market interest rate curves. In addition, credit valuation adjustments, which consider the impact of any credit enhancements to the contracts, are incorporated in the fair values to account for potential nonperformance risk, including our own nonperformance risk and the respective counterparty's nonperformance risk. The fair value of interest rate caps is determined using the market standard methodology of discounting the future expected cash receipts which would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observed market interest rate curves and volatilities.

Although we have determined the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default. However, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined the credit valuation adjustments are not significant to the overall valuation of our derivatives. As a result, we have determined our derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

Income Recognition. Our rental and other property revenue is recorded when due from residents and is recognized monthly as it is earned. Other property revenue consists primarily of utility rebillings and administrative, application, and other transactional fees charged to our residents. Our apartment homes are rented to residents on lease terms generally ranging from six to fifteen months, with monthly payments due in advance. All other sources of income, including interest and fee and asset management income, are recognized as earned. Eight of our properties are subject to rent control. Operations of multifamily properties acquired are recorded from the date of acquisition in accordance with the acquisition method of accounting. In management's opinion, due to the number of residents, the types and diversity of submarkets in which our properties operate, and the collection terms, there is no significant concentration of credit risk.

Insurance. Our primary lines of insurance coverage are property, general liability, and health and workers' compensation. We believe our insurance coverage adequately insures our properties against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood, and other perils and adequately insures us against other risks. Losses are accrued based upon our estimates of the aggregate liability for claims incurred using certain actuarial assumptions followed in the insurance industry and based on our experience.

Other Assets, Net. Other assets in our consolidated financial statements include investments under deferred compensation plans, deferred financing costs, non-real estate leasehold improvements and equipment, prepaid expenses, the value of in-place leases net of related accumulated amortization, available-for-sale investments, and other miscellaneous receivables. Investments under deferred compensation plans are classified as trading securities and are adjusted to fair market value at period end. See further discussion of our investments under deferred compensation plans in Note 11, "Share-based Compensation and Benefit Plans." Deferred financing costs are amortized no longer than the terms of the related debt on the straight-line method, which approximates the effective interest method. Corporate leasehold improvements and equipment are depreciated using the straight-line method over the shorter of the expected useful lives or the lease terms which range from three to ten years. Our available-for-sale investments are carried at fair value with unrealized gains and losses included in accumulated other comprehensive income (loss), a separate component of shareholders' equity.

Reportable Segments. Our multifamily communities are geographically diversified throughout the United States, and management evaluates operating performance on an individual property level. As each of our apartment communities has similar economic characteristics, residents, and products and services, our apartment communities have been aggregated into one reportable segment. Our multifamily communities generate rental revenue and other income through the leasing of apartment homes, which comprised approximately 98%, 97%, and 98% of our total property revenues and total non-property income, excluding income on deferred compensation plans for the years ended December 31, 2011, 2010, and 2009, respectively.

Restricted Cash. Restricted cash consists of escrow deposits held by lenders for property taxes, insurance and replacement reserves, cash required to be segregated for the repayment of residents' security deposits, and escrowed amounts related to our development and acquisition activities. Substantially all restricted cash is invested in demand and short-term instruments.

Share-based Compensation. Compensation expense associated with share-based awards is recognized in our consolidated statements of income (loss) and comprehensive income using the grant-date fair values. Compensation cost for all share-based awards, including options, requires measurement at estimated fair value on the grant date and recognition of compensation expense over the requisite service period for awards expected to vest. The fair value of stock option grants is estimated using the Black-Scholes valuation model. Valuation models require the input of assumptions, including judgments to estimate the expected stock price volatility, expected life, and forfeiture rate. The compensation cost for share-based awards is based on the market value of the shares on the date of grant.

Use of Estimates. In the application of GAAP, management is required to make estimates and assumptions which affect the reported amounts of assets and liabilities at the date of the financial statements, results of operations during the reporting periods, and related disclosures. Our more significant estimates include estimates supporting our impairment analysis related to the carrying values of our real estate assets, and estimates related to the valuation of our investments in joint ventures. These estimates are based on historical experience and other assumptions believed to be reasonable under the circumstances. Future events rarely develop exactly as forecasted, and the best estimates routinely require adjustment.

Recent Accounting Pronouncements. In May 2011, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2011-04 ("ASU 2011-04"), "Fair Value Measurement (Topic 820), Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS." ASU 2011-04 requires entities to separately disclose the amounts and reasons for any transfers of assets and liabilities into and out of Level 1 and Level 2 of the fair value hierarchy. For fair value measurements using significant unobservable inputs (Level 3), entities will be required to disclose quantitative information about the significant unobservable inputs used for all Level 3 measurements and a description of the valuation processes in determining fair value. In addition, ASU 2011-04 requires entities to provide a qualitative discussion about the sensitivity of recurring Level 3 measurements to changes in the unobservable inputs disclosed, including the interrelationship between inputs. Entities will also be required to disclose information about when the current use of a non-financial asset measured at fair value differs from its highest and best use and the hierarchy classification for items whose fair value is not recorded on the balance sheet but is disclosed in the notes. We do not anticipate changes to our existing classification and measurement of fair value when the amended standard becomes effective on January 1, 2012; however, we do expect our disclosures will be expanded as a result.

In June 2011, the FASB issued Accounting Standards Update 2011-05 ("ASU 2011-05"), "Presentation of Comprehensive Income." ASU 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of changes in stockholders' equity and requires all nonowner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. Additionally, ASU 2011-05 requires an entity to present reclassification adjustments on the face of the financial statements from other comprehensive income to net income. ASU 2011-05 is effective for us beginning January 1, 2012. We do not expect ASU 2011-05 to have a material effect on our financial statements as we currently present other comprehensive income components in a separate but consecutive statement.

In December 2011, the FASB issued Accounting Standards Update 2011-10 ("ASU 2011-10"), "Property Plant & Equipment (Topic 360): Derecognition of In-Substance Real Estate – a Scope Clarification." ASU 2011-10 resolves the diversity in practice about whether the guidance under FASB Accounting Standards Codification ("ASC") Subtopic 360-20, "Property, Plant, and Equipment – Real Estate Sales," applies to the derecognition of in substance real estate when a parent ceases to have a controlling financial interest in a subsidiary, as specified under ASC Subtopic 810-10, "Non-Controlling Interests in Consolidated Financial Statements – an amendment of ARB No. 51," that is in substance real estate as a result of default by the subsidiary on its nonrecourse debt. The new guidance is intended to emphasize the accounting for such transactions which is based upon substance over form. ASU 2011-10 is effective for us beginning July 1, 2012 and is not expected to have a material effect on our financial statements.

In December 2011, the FASB issued Accounting Standards Update 2011-12 ("ASU 2011-12"), "Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05." ASU 2011-12 indefinitely defers the requirements for entities to present reclassification adjustments out of accumulated other comprehensive income by component in both the statement in which net income is presented and the statement in which other comprehensive income is presented. Entities will still be required to comply with the other aspects of ASU 2011-05 as noted above. ASU 2011-12 is effective for us beginning January 1, 2012 and is not expected to have a material effect on our financial statements.

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Share-Based Compensation And Benefit Plans (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended
	Jan. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment awards, shares available for grant		2,600,000
Common share options exercised		504,838	141,213	18,521
Total intrinsic value of options exercised		$ 9,600,000	$ 1,500,000	$ 100,000
Vesting period of options, minimum, years		three
Vesting period of options, maximum, years		five
Share awards vesting period, years		five
Remaining weighted average contractual life (years) outstanding options		4.7
Remaining weighted average contractual life (years) exercisable options		3.5
Fair value of shares vested		11,500,000	10,600,000	10,200,000
Total compensation cost for option and share awards		12,300,000	11,700,000	8,700,000
Total capitalized compensation cost for option and share awards		900,000	1,000,000	1,700,000
Percentage of market value, shares purchase price under ESPP		85.00%
Employee share purchase plan, maximum authorized amount		25,000
Shares purchased under ESPP	4,721	19,914	29,100	34,649
Share awards held in trust		2,000,000	2,000,000
Share awards held in non-qualified deferred compensation plan shares		900,000	700,000
Market value of trading securities held in non-qualified deferred compensation plan		14,500,000	14,300,000
Market value of trading securities held in Rabbi Trust		45,200,000	53,100,000
Percentage of company's matching contribution vested after one year		33.00%
Percentage of company's matching contribution vested after two years		67.00%
Percentage of company's matching contribution vested after three years		100.00%
2011 Share Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares which could be granted pursuant to full value awards		2,600,000
Share-based payment awards, shares available for grant		9,100,000
Units available under the 2011 Share Plan		5,800,000
Fungible units transferred from the 2002 Share Plan to the 2011 Share Plan		3,300,000
Fungible units to full value award conversion ratio		3.45
Expiration value of option right or other award		0.83
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested options which is expected to be amortized		1,300,000
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans, years		3
Share Awards and Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested options which is expected to be amortized		27,300,000
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans, years		4
Rabbi Trust [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Receivables from participants upon withdrawal		28,700,000	31,400,000
401(K) Savings Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Matching contribution made to savings plan		$ 1,800,000	$ 1,300,000	$ 1,300,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range for options exercised during the period		$ 30.06
Percentage increase in options exercisable per year		20.00%
Authorized percentage of contributions to savings plan by participant		1.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range for options exercised during the period		$ 62.32
Percentage increase in options exercisable per year		33.33%
Authorized percentage of contributions to savings plan by participant		60.00%

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Share Data (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011		Mar. 31, 2011	Dec. 31, 2010		Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Share Data [Abstract]
Income (loss) from continuing operations attributable to common shareholders												$ 22,546		$ 8,242		$ (75,201)
Amount allocated to participating securities												(551)		(265)		637
Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities												21,995		7,977		(74,564)
Income from discontinued operations, including gain on sale, attributable to common shareholders												26,833		14,974		24,401
Net income (loss) attributable to common shareholders, as adjusted												48,828		22,951		(50,163)
Income (loss) from continuing operations attributable to common shareholders, as adjusted - per share												$ 0.30		$ 0.11		$ (1.19)
Income from discontinued operations, including gain on sale, attributable to common shareholders - per share												$ 0.37		$ 0.22		$ 0.39
Net income (loss) attributable to common shareholders, as adjusted - per share	$ 0.63	[1]	$ 0.16	$ (0.23)	[2]	$ 0.10	$ 0.24	[3]	$ 0.02	$ 0.03	$ 0.03	$ 0.67	[4]	$ 0.33	[4]	$ (0.80)
Weighted average number of common shares outstanding - basic												72,756,000		68,608,000		62,359,000
Income allocated to common units												$ 45
Income (loss) from continuing operations attibutable to shareholders, as adjusted												22,040		7,977		(74,564)
Net income (loss) attributable to common shareholders, as adjusted												$ 48,873		$ 22,951		$ (50,163)
Income (loss) from continuing operations attributable to common shareholders, as adjusted - per share												$ 0.30		$ 0.11		$ (1.19)
Income from discontinued operations, including gain on sale, attributable to common shareholders - per share												$ 0.36		$ 0.22		$ 0.39
Net income (loss) attributable to common shareholders, as adjusted - per share	$ 0.62	[1]	$ 0.16	$ (0.23)	[2]	$ 0.10	$ 0.24	[3]	$ 0.02	$ 0.03	$ 0.03	$ 0.66	[4]	$ 0.33	[4]	$ (0.80)
Common share options and share awards granted												706,000		349,000
Common units												239,000
Weighted average number of common shares outstanding - diluted												73,701,000		68,957,000		62,359,000
Number of common share equivalent securities excluded from the diluted earnings per share calculation												3,800,000		4,800,000		4,900,000

[1] Includes a $24,621, or $0.33 basic and diluted per share, impact related to the gain on sale of discontinued operations.

[2] Includes a $29,791 loss, or $0.41 basic and diluted per share, impact related to a loss on discontinuation of a hedging relationship.

[3] Includes a $9,614, or $0.14 basic and $0.13 diluted per share, impact related to the gain on sale of discontinued operations.

[4] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

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Common Shares (Tables)

12 Months Ended

Dec. 31, 2011

2010 ATM Program [Member]

Activity Under Share Offering Program [Line Items]

Activity Under At-The-Market Share Offering Program

		September 30,		September 30,
	Year Ended December 31,
	2011		2010
Total net consideration	$	13,847.0	$	231,650.5
Common shares sold		252.5		4,867.7
Average price per share	$	55.81	$	48.37

2011 ATM Program [Member]

Activity Under Share Offering Program [Line Items]

Activity Under At-The-Market Share Offering Program

		September 30,
	Year Ended December 31, 2011
Total net consideration	$	92,723.6
Common shares sold		1,498.5
Average price per share	$	62.98

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Share Data (Tables)

12 Months Ended

Dec. 31, 2011

Share Data [Abstract]

Calculation Of Basic And Diluted Earnings Per Share

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands, except per share amounts)	2011			2010			2009
Earnings per share calculation – basic
Income (loss) from continuing operations attributable to common shareholders	$	22,546		$	8,242		$	(75,201	)
Amount allocated to participating securities		(551	)		(265	)		637
Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities		21,995			7,977			(74,564	)
Income from discontinued operations, including gain on sale, attributable to common shareholders		26,833			14,974			24,401
Net income (loss) attributable to common shareholders, as adjusted	$	48,828		$	22,951		$	(50,163	)
Income (loss) from continuing operations attributable to common shareholders,as adjusted – per share	$	0.30		$	0.11		$	(1.19	)
Income from discontinued operations, including gain on sale, attributable to common shareholders – per share		0.37			0.22			0.39
Net income (loss) attributable to common shareholders, as adjusted – per share	$	0.67		$	0.33		$	(0.80	)
Weighted average number of common shares outstanding – basic		72,756			68,608			62,359
Earnings per share calculation – diluted
Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities	$	21,995		$	7,977		$	(74,564	)
Income allocated to common units		45			—			—
Income (loss) from continuing operations attributable to common shareholders, as adjusted		22,040			7,977			(74,564	)
Income from discontinued operations, including gain on sale, attributable to common shareholders		26,833			14,974			24,401
Net income (loss) attributable to common shareholders, as adjusted	$	48,873		$	22,951		$	(50,163	)
Income (loss) from continuing operations attributable to common shareholders, as adjusted – per share	$	0.30		$	0.11		$	(1.19	)
Income from discontinued operations, including gain on sale, attributable to common shareholders – per share		0.36			0.22			0.39
Net income (loss) attributable to common shareholders, as adjusted – per share	$	0.66		$	0.33		$	(0.80	)
Weighted average number of common shares outstanding – basic		72,756			68,608			62,359
Incremental shares issuable from assumed conversion of:
Common share options and share awards granted		706			349			—
Common units		239			—			—
Weighted average number of common shares outstanding – diluted		73,701			68,957			62,359

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Notes Payable (Summary Of Indebtedness) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Unsecured notes payable	$ 1,380,755,000	$ 1,507,757,000
Total secured notes payable	1,051,357,000	1,055,997,000
Total notes payable	2,432,100,000	2,563,800,000
Commercial Banks [Member]
Debt Instrument [Line Items]
Unsecured notes payable		500,000,000
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured notes payable	1,380,700,000	972,400,000
Term Loan, Due 2012 [Member] | Commercial Banks [Member]
Debt Instrument [Line Items]
Unsecured notes payable		500,000,000
Notes payable, maturity date	2012
7.69% Notes Due 2011 [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured notes payable		88,000,000
Notes payable, maturity date	2012
Effective annual interest rate on secured credit	7.69%
5.93% Notes Due 2012 [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured notes payable	189,600,000	189,500,000
Notes payable, maturity date	2013
Effective annual interest rate on secured credit	5.93%
5.45% Notes Due 2013 [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured notes payable	199,700,000	199,600,000
Notes payable, maturity date	2015
Effective annual interest rate on secured credit	5.45%
5.08% Notes Due 2015 [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured notes payable	249,300,000	249,200,000
Notes payable, maturity date	2017
Effective annual interest rate on secured credit	5.08%
5.75% Notes Due 2017 [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured notes payable	246,200,000	246,100,000
Effective annual interest rate on secured credit	5.75%
4.70% Notes Due 2021 [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured notes payable	248,600,000
Notes payable, maturity date	2021
Effective annual interest rate on secured credit	4.70%
5.00% Notes Due 2023 [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Unsecured notes payable	247,300,000
Notes payable, maturity date	2023
Effective annual interest rate on secured credit	5.00%
4.99% Notes Due 2011 [Member] | Medium-Term Notes [Member]
Debt Instrument [Line Items]
Unsecured notes payable		35,400,000
Notes payable, maturity date	2011
Effective annual interest rate on secured credit	4.99%
0.91% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Debt Instrument [Line Items]
Total secured notes payable	1,012,300,000	1,015,700,000
1.59% Tax-Exempt Mortgage Note, Due 2028 [Member]
Debt Instrument [Line Items]
Total secured notes payable	39,100,000	40,300,000
Notes payable, maturity date	2028
Effective annual interest rate on secured credit	1.59%
Floating Rate Tax-Exempt Debt Inlcuded In Secured Notes (1.59%) [Member]
Debt Instrument [Line Items]
Total secured notes payable	39,100,000	40,300,000
Effective annual interest rate on secured credit	1.59%
Floating Rate Debt Included In Secured Notes (0.91% - 1.73%) [Member]
Debt Instrument [Line Items]
Total secured notes payable	206,400,000	189,900,000
Value Of Real Estate Assets, At Cost [Member]
Debt Instrument [Line Items]
Value of real estate assets, at cost, subject to secured notes	1,651,000,000	1,629,600,000
Total [Member]
Debt Instrument [Line Items]
Unsecured notes payable	$ 1,380,700,000	$ 1,507,800,000
Minimum [Member] | 0.91% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Debt Instrument [Line Items]
Notes payable, maturity date	2012
Effective annual interest rate on secured credit	0.91%
Minimum [Member] | Floating Rate Debt Included In Secured Notes (0.91% - 1.73%) [Member]
Debt Instrument [Line Items]
Effective annual interest rate on secured credit	0.91%
Maximum [Member] | 0.91% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Debt Instrument [Line Items]
Notes payable, maturity date	2045
Effective annual interest rate on secured credit	6.00%
Maximum [Member] | Floating Rate Debt Included In Secured Notes (0.91% - 1.73%) [Member]
Debt Instrument [Line Items]
Effective annual interest rate on secured credit	1.73%

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Common Shares (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended			57 Months Ended	1 Months Ended	12 Months Ended		1 Months Ended		2 Months Ended	12 Months Ended	1 Months Ended
	Jan. 31, 2008	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011	Mar. 31, 2010 2010 ATM Program [Member]	Dec. 31, 2011 2010 ATM Program [Member]	Dec. 31, 2010 2010 ATM Program [Member]	Jan. 31, 2012 2011 ATM Program [Member]	May 31, 2011 2011 ATM Program [Member]	Feb. 17, 2012 2011 ATM Program [Member]	Dec. 31, 2011 2011 ATM Program [Member]	Jan. 31, 2012 Issuance of Equity [Member]
Activity Under Share Offering Program [Line Items]
Shares repurchase program, authorized amount	$ 500,000,000
Stock repurchased during period, shares					4,300,000
Stock repurchased during period, value				(6,000)	230,200,000
Remaining dollar value of securities authorized to be repurchased		269,800,000
Maximum aggregate offering price of common shares						250,000,000				300,000,000
Common shares sold							252,500	4,867,700	100,000		0	1,498,500	6,612,500
Average price per share							$ 55.81	$ 48.37	$ 62.41		$ 0.00	$ 62.98
Total net consideration		106,571,000	231,651,000	272,112,000			13,847,000	231,650,500	3,200,000		0	92,723,600	391,600,000
Maximum aggregate offering price of remaining common shares available for sale												$ 202,400,000
Number of common and preferred stock authorized to issue		110,000,000			110,000,000
Common shares, authorized		100,000,000	100,000,000		100,000,000
Preferred shares, authorized		10,000,000			10,000,000
Common shares, outstanding		72,000,000			72,000,000
Preferred shares, outstanding		0			0
Common shares available for sale		100,000,000	100,000,000		100,000,000
Equity method investment ownership percentage		80.00%			80.00%

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Reconciliation Of Net Income To REIT Taxable Income

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands)	2011			2010			2009
Net income (loss)	$	59,961		$	31,142		$	(44,203	)
Less (income) loss attributable to noncontrolling interests		(3,582	)		(926	)		403
Less income allocated to perpetual preferred units		(7,000	)		(7,000	)		(7,000	)
Net income (loss) attributable to common shareholders		49,379			23,216			(50,800	)
Loss of taxable REIT subsidiaries included above		539			2,056			25,124
Net income (loss) from REIT operations		49,918			25,272			(25,676	)
Book depreciation and amortization, including discontinued operations		188,042			179,662			178,607
Tax depreciation and amortization		(155,636	)		(158,134	)		(164,639	)
Book/tax difference on gains/losses from capital transactions		(4,315	)		37,798			(7,059	)
Book/tax difference on impairment associated with land development activities		—			—			62,397
Other book/tax differences, net		8,205			(10,565	)		(24,188	)
REIT taxable income		86,214			74,033			19,442
Dividends paid deduction		(143,657	)		(124,999	)		(128,507	)
Dividends paid in excess of taxable income	$	(57,443	)	$	(50,966	)	$	(109,065	)

Schedule Of Per Share Distributions Reported To Shareholders

		September 30,			September 30,			September 30,
	Year Ended December 31,
	2011			2010			2009
Common Share Distributions
Ordinary income	$	1.08		$	0.89		$	1.74
Long-term capital gain		0.13			0.20			0.25
Unrecaptured Sec. 1250 gain		0.23			0.48			0.06
Return of capital		0.52			0.23			—
Total	$	1.96		$	1.80		$	2.05
Percentage of distributions representing tax preference items		2.83	%		3.91	%		3.94	%

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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Tables)

12 Months Ended

Dec. 31, 2011

Property Acquisitions Discontinued Operation And Assets Held For Sale [Abstract]

Summary Of Income From Discontinued Operations

		September 30,		September 30,		September 30,
	Year Ended December 31,
(in thousands)	2011		2010		2009
Property revenues	$	9,206	$	19,728	$	23,686
Property expenses		4,696		9,170		10,335
		4,510		10,558		13,351
Depreciation and amortization		2,298		5,198		5,837
Income from discontinued operations	$	2,212	$	5,360	$	7,514
Gain on sale of discontinued operations, net of tax	$	24,621	$	9,614	$	16,887

Pro Forma Consolidated Income Statement Information

		September 30,		September 30,
	Pro Forma Year Ended December 31,
(in thousands)	2010		2009
	(unaudited)
Property revenues	$	618,611	$	621,101
Property operating income	$	368,264	$	375,252

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Description Of Business

12 Months Ended

Dec. 31, 2011

Description Of Business [Abstract]

Description Of Business

1. Description of Business

Business. Formed on May 25, 1993, Camden Property Trust, a Texas real estate investment trust ("REIT"), is primarily engaged in the ownership, management, development, acquisition, and construction of multifamily apartment communities. Our multifamily apartment communities are referred to as "communities," "multifamily communities," "properties," or "multifamily properties" in the following discussion. As of December 31, 2011, we owned interests in, operated, or were developing 206 multifamily properties comprising 69,794 apartment homes across the United States. Of these 206 properties, ten properties were under development and when completed will consist of a total of 2,797 apartment homes. In addition, we own land parcels we may develop into multifamily apartment communities.

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Investments In Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2011

Investments In Joint Ventures [Abstract]

Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures

	September 30,	September 30,		September 30,		September 30,
			2011		2010
Total assets			$	1,394.9	$	935.3
Total third-party debt				1,093.9		810.1
Total equity				261.6		105.3

		September 30,		September 30,	September 30,		September 30,
	2011			2010		2009
Total revenues	$	164.4		$137.6		$	137.3
Gain on sale of operating properties, net of tax		17.4		—			—
Net income (loss)		(3.2	)	(19.1)			(18.0	)
Equity in income (loss) (1)		5.7		(0.8)			0.7

(1) Equity in income (loss) of unconsolidated joint ventures excludes our ownership interest of fee income from various property management services and interest income from mezzanine loans with our joint ventures.

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Description Of Business (Details)	Dec. 31, 2011
Description Of Business [Abstract]
Number of multifamily properties comprising of apartment homes	206
Total number of apartment homes in multifamily communities	69,794
Number of multifamily properties under development	10
Total number of apartment homes in multifamily properties upon completion of development	2,797

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Investments In Joint Ventures (Narrative) (Details) (USD $)	1 Months Ended				3 Months Ended	12 Months Ended
	Jan. 31, 2012	Jun. 30, 2011	Apr. 30, 2011	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments in and Advances to Affiliates [Line Items]
Number of joint ventures accounted for under equity method investments						17
Equity method investment ownership percentage					20.00%	20.00%
Fees earned for property and asset management, construction, development, and other services to joint ventures						$ 9,300,000	$ 6,200,000	$ 6,800,000
Fees earned on third-party construction projects						700,000	2,000,000	1,200,000
Number of joint ventures sold				3
Number of operating properties sold	1				4
Proceeds from sale of unconsolidated joint ventures				19,300,000
Gain on sale of unconsolidated joint venture interests				1,100,000		1,136,000
Number of development properties sold		1	1
Number of multifamily properties acquired	1					18
Business Acquisition, Percentage of Voting Interests Acquired					80.00%	80.00%
Mortgage debt assumed							188,119,000
Houston, Texas [Member]
Investments in and Advances to Affiliates [Line Items]
Number of units in multifamily properties acquired						2,846
Atlanta, Georgia [Member]
Investments in and Advances to Affiliates [Line Items]
Number of units in multifamily properties acquired						234
Tampa, Florida [Member]
Investments in and Advances to Affiliates [Line Items]
Number of units in multifamily properties acquired						450
Austin, Texas [Member]
Investments in and Advances to Affiliates [Line Items]
Number of units in multifamily properties acquired						768
Proceeds from sale of property		3,100,000
Gain on sale of properties		100,000
San Antonio, Texas [Member]
Investments in and Advances to Affiliates [Line Items]
Number of units in multifamily properties acquired						528
Dallas, Texas [Member]
Investments in and Advances to Affiliates [Line Items]
Number of units in multifamily properties acquired						1,250
Washington, D.C. [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment ownership percentage			20.00%
Proceeds from sale of development property with reimbursement			9,400,000
Gain on sale of properties			4,700,000
Louisville, Kentucky [Member]
Investments in and Advances to Affiliates [Line Items]
Gain on sale of unconsolidated joint venture interests					6,400,000
Number of apartment units in property disposed					1,194
Dallas, Houston, Las Vegas, Phoenix, and Southern California [Member]
Investments in and Advances to Affiliates [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	80.00%
Number of unconsolidated equity method investments acquired	12
Purchase remaining interest	99,500,000
Repayments of Assumed Debt	272,600,000
Minimum [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment ownership percentage					15.00%	15.00%
Maximum [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment ownership percentage					50.00%	50.00%
Acquisition [Member] | Raleigh, North Carolina [Member]
Investments in and Advances to Affiliates [Line Items]
Number of units in multifamily properties acquired	350
Acquisition [Member] | Dallas, Houston, Las Vegas, Phoenix, and Southern California [Member]
Investments in and Advances to Affiliates [Line Items]
Number of apartment units in wholly owned property acquired	4,034

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Postretirement Benefits (Change In Benefit Obligation Benefit Plans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Postretirement Benefits [Abstract]
Postretirement benefit obligation, beginning of year	$ 2,844	$ 2,949
Net periodic benefit cost	193	174	181
Actuarial (gain) loss	609	(65)
Prior service cost	291
Amortization of prior service cost	(16)
Interest cost	177	174	181
Benefits paid	(220)	(214)
Accumulated postretirement benefit obligation, end of year	$ 3,701	$ 2,844	$ 2,949

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Land	$ 768,016	$ 760,397
Buildings and improvements	4,751,654	4,680,361
Real estate assets, at cost, total	5,519,670	5,440,758
Accumulated depreciation	(1,432,799)	(1,292,924)
Net operating real estate assets	4,086,871	4,147,834
Properties under development, including land	299,870	206,919
Investments in joint ventures	44,844	27,632
Properties held for sale	11,131
Total real estate assets	4,442,716	4,382,385
Accounts receivable - affiliates	31,035	31,895
Notes receivable - affiliates		3,194
Other assets, net	88,089	106,175
Cash and cash equivalents	55,159	170,575
Restricted cash	5,076	5,513
Total assets	4,622,075	4,699,737
Liabilities
Unsecured notes payable	1,380,755	1,507,757
Secured notes payable	1,051,357	1,055,997
Accounts payable and accrued expenses	93,747	81,556
Accrued real estate taxes	21,883	22,338
Distributions payable	39,364	35,295
Other liabilities	109,276	141,496
Total liabilities	2,696,382	2,844,439
Commitments and contingencies
Perpetual preferred units	97,925	97,925
Equity
Common shares of beneficial interest; $0.01 par value per share; 100,000 shares authorized; 87,377 and 85,130 issued; 84,517 and 82,386 outstanding at December 31, 2011 and 2010, respectively	845	824
Additional paid-in capital	2,901,024	2,775,625
Distributions in excess of net income attributable to common shareholders	(690,466)	(595,317)
Treasury shares, at cost (12,509 and 12,766 common shares, at December 31, 2011 and 2010, respectively)	(452,003)	(461,255)
Accumulated other comprehensive loss	(683)	(33,458)
Total common equity	1,758,717	1,686,419
Noncontrolling interests	69,051	70,954
Total equity	1,827,768	1,757,373
Total liabilities and equity	$ 4,622,075	$ 4,699,737

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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) (USD $)	12 Months Ended					1 Months Ended	2 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 2010 ATM Program [Member]	Dec. 31, 2010 2010 ATM Program [Member]	Jan. 31, 2012 2011 ATM Program [Member]	Feb. 17, 2012 2011 ATM Program [Member]	Dec. 31, 2011 2011 ATM Program [Member]
Activity Under Share Offering Program [Line Items]
Total net consideration	$ 106,571,000	$ 231,651,000	$ 272,112,000	$ 13,847,000	$ 231,650,500	$ 3,200,000	$ 0	$ 92,723,600
Common shares sold				252,500	4,867,700	100,000	0	1,498,500
Average price per share				$ 55.81	$ 48.37	$ 62.41	$ 0.00	$ 62.98

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Consolidated Statements Of Equity And Perpetual Preferred Units (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Common share options exercised	504,838	141,213	18,521
Cash distributions per share	$ 1.96	$ 1.80	$ 2.05
Common Shares Of Beneficial Interest [Member]
Common shares issued	1,751,000	4,868,000	10,350,000
Conversions and redemptions of operating partnership units, shares	66,000	279,000	139,000
Additional Paid-In Capital [Member]
Common shares issued	1,751,000	4,868,000	10,350,000
Common share options exercised	68,000	41,000	19,000
Conversions and redemptions of operating partnership units, shares	66,000	279,000	139,000
Distributions In Excess Of Net Income [Member]
Cash distributions per share	$ 1.96	$ 1.8	$ 2.05
Treasury Shares, At Cost [Member]
Common share options exercised	68,000
Noncontrolling Interests [Member]
Conversions and redemptions of operating partnership units, shares	66,000	279,000	139,000
Cash distributions per share	$ 1.96	$ 1.8	$ 2.05

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Derivative Instruments And Hedging Activities (Schedule Of Outstanding Interest Rate Derivatives) (Details) (Not-Designated [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Interest Rate Cap [Member]
Derivative [Line Items]
Number of Instruments	1
Notional Amount	$ 175.0
Interest Rate Swaps [Member]
Derivative [Line Items]
Number of Instruments	1
Notional Amount	$ 500.0

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Financial Assets And Liabilities Measured At Fair Value

		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,
	December 31, 2011								December 31, 2010
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Deferred compensation plan investments	$	41.0	$	—	$	—	$	41.0	$	46.7	$	—	$	—	$	46.7
Available-for-sale investment		—		—		—		—		5.0		—		—		5.0
Derivative financial instruments		—		0.1		—		0.1		—		—		—		—
Liabilities
Derivative financial instruments	$	—	$	16.6	$	—	$	16.6	$	—	$	36.9	$	—	$	36.9

Fair Value Of Notes Receivable And Notes Payable

		September 30,		September 30,		September 30,		September 30,
	December 31, 2011				December 31, 2010
(in millions)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Notes receivable – affiliates	$	—	$	—	$	3.2	$	3.2
Fixed rate notes payable (1)		2,186.6		2,304.4		2,333.5		2,386.0
Floating rate notes payable		245.5		233.6		230.3		212.7

(1) December 31, 2010 includes a $500 million term loan entered into in 2007, and a $16.6 million construction loan entered into in 2008 which are effectively fixed by the use of interest rate swaps but evaluated for estimated fair value at the floating rate. The $500 million term loan was repaid in June 2011. The $16.6 million construction loan interest rate swap matured and was not extended in conjunction with the one-year extension of the loan in July 2011.

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Share-Based Compensation And Benefit Plans (Summary Of Share Incentive Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Share-Based Compensation And Benefit Plans [Abstract]
Outstanding Options, Balance Beginning	1,847,136		1,983,358	1,536,527
Weighted Average Exercise/Grant Price, balance beginning	$ 42.37		$ 41.39	$ 44.96
Granted, Options Outstanding			55,895	489,509
Granted, Weighted Average Exercise/Grant Price			$ 43.94	$ 30.06
Exercised/Vested, Options Outstanding	(504,838)		(141,213)	(18,521)
Exercised/Vested, Weighted Average Exercise/Grant Price	$ 42.59		$ 32.54	$ 33.45
Forfeited, Options Outstanding	(2,762)		(50,904)	(24,157)
Forfeited, Weighted Average Exercise/Grant Price	$ 48.02		$ 46.65	$ 45.08
Net activity, Options Outstanding	(507,600)		(136,222)	446,831
Outstanding Options, Balance Ending	1,339,536	[1]	1,847,136	1,983,358
Weighted Average Exercise/Grant Price, balance ending	$ 42.27		$ 42.37	$ 41.39
Nonvested share awards outstanding beginning, Share Awards Outstanding	741,505		595,153	520,285
Nonvested share awards outstanding beginning, Weighted Average Exercise/Grant Price	$ 42.16		$ 46.20	$ 59.40
Granted, Share Awards Outstanding	347,084		372,661	329,018
Granted, Weighted Average Exercise/Grant Price	$ 57.00		$ 40.05	$ 30.11
Exercised/Vested, Share Awards Outstanding	(243,874)		(214,923)	(188,892)
Exercised/Vested, Weighted Average Exercise/Grant Price	$ 47.19		$ 49.17	$ 53.76
Forfeited, Share Awards Outstanding	(25,961)		(11,386)	(65,258)
Forfeited, Weighted Average Exercise/Grant Price	$ 44.51		$ 39.64	$ 51.06
Net activity, Nonvested Share Awards Outstanding	77,249		146,352	74,868
Nonvested share awards outstanding ending, Share Awards Outstanding	818,754		741,505	595,153
Nonvested share awards outstanding ending, Weighted Average Exercise/Grant Price	$ 46.88		$ 42.16	$ 46.20

[1] The aggregate intrinsic value of outstanding and exercisable options at December 31, 2011 was approximately $27.0 million and $14.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $62.24 per share on December 31, 2011 and the strike price of the underlying award.

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Postretirement Benefits

12 Months Ended

Dec. 31, 2011

Postretirement Benefits [Abstract]

Postretirement Benefits

15. Postretirement Benefits

We maintain a postretirement benefit for two former officers of Summit, who also serve on our Board of Trust Managers. Benefits received by these former employees include medical benefits and office space. Participants in the postretirement plan contribute to the cost of the medical benefits. Our contribution for medical benefits was limited to amounts between $540 and $1,260 per month per participant including dependents. We contributed approximately $0.2 million for office space during the year ended December 31, 2011 and expect to contribute $0.2 million for office space in 2012. For measurement purposes, a 7.8% rate of increase in the per capita cost of covered health care claims was assumed; the rate of increase was assumed to decrease until 2027 at which point the annual rate of increase would be 4.5% and remain at that level thereafter.

As of December 31, the status of our defined postretirement benefit plan, calculated using generally accepted actuarial principles and procedures, was as follows:

		September 30,			September 30,
(in thousands)	2011			2010
Postretirement benefit obligation, beginning of year	$	2,844		$	2,949
Net periodic benefit cost		193			174
Actuarial (gain) loss		609			(65	)
Prior service cost		291			—
Amortization of prior service cost		(16	)		—
Benefits paid		(220	)		(214	)
Accumulated postretirement benefit obligation, end of year	$	3,701		$	2,844

The weighted average discount rate used to determine the value of accumulated postretirement benefit obligation for the years ended December 31, 2011 and 2010 was 4.50% and 6.10%, respectively. Postretirement liabilities are recorded in other liabilities in our consolidated balance sheets.

The following table details the components of net periodic benefit cost for the years ended December 31 related to postretirement benefits.

		September 30,		September 30,		September 30,
(in thousands)	2011		2010		2009
Interest cost	$	177	$	174	$	181
Amortization of prior service cost		16		—		—
Total net periodic benefit cost	$	193	$	174	$	181

The weighted average discount rate used to determine the value of the net periodic benefit cost for the years ended December 31, 2011, 2010 and 2009 was 5.25%, 6.10% and 6.29%, respectively.

The following table details the change in plan assets for the years ended December 31 related to postretirement benefits.

		September 30,			September 30,
(in thousands)	2011			2010
Fair value of plan assets at end of prior year	$	—		$	—
Employer contributions		220			214
Benefits paid		(220	)		(214	)
Fair value of plan assets at end of year	$	—		$	—

The following table details the amounts recognized in our accumulated other comprehensive income (loss) at December 31 related to postretirement benefits.

		September 30,			September 30,
(in thousands)	2011			2010
Accumulated other comprehensive income, beginning of year	$	201		$	136
Prior service cost arising during period		(291	)		—
Amortization of prior service cost		16			—
Net actuarial gain (loss) arising during period		(609	)		65
Accumulated other comprehensive income (loss), end of year	$	(683	)	$	201

During 2012, we expect amortization of prior service cost from other comprehensive income (loss) and recognized as benefit cost to be consistent with 2011.

The benefits expected to be paid in each of the next five fiscal years, and in the aggregate for the five fiscal years thereafter, are as follows:

		September 30,
(in thousands) Year Beginning January 1	Estimated Benefit Payment
2012	$	228
2013		233
2014		239
2015		244
2016		245
2017-2021		1,273
Total	$	2,462

The estimated benefit payments are based on assumptions about future events. Actual benefit payments may vary significantly from these estimates.

A 1% increase or decrease in assumed health care cost trend rates has no significant effect on the interest cost component of net periodic postretirement benefit costs. A 1% increase or decrease in assumed health care cost trend rates would increase or decrease the accumulated postretirement benefit obligation by approximately $0.1 million.

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Net Change In Operating Accounts (Tables)

12 Months Ended

Dec. 31, 2011

Net Change In Operating Accounts [Abstract]

Effect Of Changes In The Operating Accounts On Cash Flows From Operating Activities

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands)	2011			2010			2009
Change in assets:
Other assets, net	$	5,183		$	(895	)	$	10,808
Change in liabilities:
Accounts payable and accrued expenses		2,026			2,209			(10,511	)
Accrued real estate taxes		(122	)		(1,269	)		(64	)
Other liabilities		(17,152	)		4,188			(172	)
Other		596			275			191
Change in operating accounts	$	(9,469	)	$	4,508		$	252

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Quarterly Financial Data

12 Months Ended

Dec. 31, 2011

Quarterly Financial Data [Abstract]

Quarterly Financial Data

17. Quarterly Financial Data (unaudited)

Summarized quarterly financial data, which has been adjusted for discontinued operations as discussed in Note 7, "Property Acquisitions, Discontinued Operations, Assets Held for Sale and Impairments," for the years ended December 31, 2011 and 2010, is as follows:

		September 30,		September 30,			September 30,		September 30,			September 30,
(in thousands, except per share amounts)	First		Second			Third		Fourth			Total(a)
2011:
Revenues	$	158,865	$	162,750		$	166,541	$	167,712		$	655,868
Net income (loss) attributable to common shareholders		7,286		(16,597	)		11,840		46,850			49,379
Net income (loss) attributable to common shareholders per share – basic		0.10		(0.23	)(b)		0.16		0.63	(c)		0.67
Net income (loss) attributable to common shareholders per share – diluted		0.10		(0.23	)(b)		0.16		0.62	(c)		0.66
2010:
Revenues	$	147,218	$	149,049		$	152,037	$	153,146		$	601,450
Net income attributable to common shareholders		2,285		2,134			1,650		17,147			23,216
Net income attributable to common shareholders per share – basic		0.03		0.03			0.02		0.24	(d)		0.33
Net income attributable to common shareholders per share – diluted		0.03		0.03			0.02		0.24	(d)		0.33

(a) Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

(b) Includes a $29,791 loss, or $0.41 basic and diluted per share, impact related to a loss on discontinuation of a hedging relationship.

(c) Includes a $24,621, or $0.33 basic and diluted per share, impact related to the gain on sale of discontinued operations.

(d) Includes a $9,614, or $0.14 basic and $0.13 diluted per share, impact related to the gain on sale of discontinued operations.

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Fair Value Measurements (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $)	12 Months Ended			1 Months Ended								3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Term Loan [Member]	Jul. 31, 2011 Construction Loan [Member]	Dec. 31, 2010 Construction Loan [Member]	Dec. 31, 2011 Fixed Rate Notes Payable [Member]		Dec. 31, 2010 Fixed Rate Notes Payable [Member]		Dec. 31, 2011 Floating Rate Notes Payable [Member]	Dec. 31, 2010 Floating Rate Notes Payable [Member]	Jun. 30, 2011 Commercial Banks [Member] Term Loan, Due 2012 [Member]
Fair Value Of Notes Receivable And Notes Payable [Line Items]
Notes receivable - affiliates, Carrying Value		$ 3,194,000
Notes receivable - affiliates, Estimated Fair Value		3,200,000
Carrying Value	2,432,100,000	2,563,800,000				2,186,600,000	[1]	2,333,500,000	[1]	245,500,000	230,300,000
Estimated Fair Value						2,304,400,000	[1]	2,386,000,000	[1]	233,600,000	212,700,000
Fixed rate notes payable			500,000,000		16,600,000
Construction loan extension date				July 2011
Repayment of senior unsecured notes	$ 500,000,000											$ 500,000,000

[1] December 31, 2010 includes a $500 million term loan entered into in 2007, and a $16.6 million construction loan entered into in 2008 which are effectively fixed by the use of interest rate swaps but evaluated for estimated fair value at the floating rate. The $500 million term loan was repaid in June 2011. The $16.6 million construction loan interest rate swap matured and was not extended in conjunction with the one-year extension of the loan in July 2011.

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Cash flows from operating activities
Net income (loss)	$ 59,961		$ 31,142		$ (44,203)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization, including discontinued operations	181,791		174,465		172,415
Gain on sale of discontinued operations, net of tax	(24,621)		(9,614)		(16,887)
Gain on sale of properties, including land	(4,748)		(236)
Gain on sale of unconsolidated joint venture interests	(1,136)
Gain on sale of available-for sale investment	(4,301)
Loss on discontinuation of hedging relationship	29,791
Loss on early retirement of debt					2,550
Impairment associated with land development activities					85,614
Impairment provision on technology investment			1,000
Distributions of income from joint ventures	5,329		6,524		5,664
Equity in (income) loss of joint ventures	(5,679)	[1]	839	[1]	(695)	[1]
Share-based compensation	12,039		11,306		9,053
Amortization of deferred financing costs	5,877		4,102		3,925
Net change in operating accounts	(9,469)		4,508		252
Net cash from operating activities	244,834		224,036		217,688
Cash flows from investing activities
Development and capital improvements	(227,755)		(63,739)		(72,779)
Proceeds from sale of joint venture interests	19,310
Proceeds from sales of properties, including land and discontinued operations	57,312		102,819		28,078
Proceeds from sale of available-for-sale investment	4,510
Decrease in notes receivable - affiliates	3,279		637		1,978
Investments in joint ventures	(46,037)		(6,467)		(23,159)
Payments received on notes receivable - other					8,710
Increase in notes receivable - affiliates	(129)		(511)		(7,332)
Distributions of investments from joint ventures	6,005		28		161
Other	(3,859)		2,383		(5,173)
Net cash from investing activities	(187,364)		35,150		(69,516)
Cash flows from financing activities
Borrowings on unsecured line of credit	8,000		37,000
Repayments on unsecured line of credit	(8,000)		(37,000)		(145,000)
Proceeds from issuance of common shares	106,571		231,651		272,112
Proceeds from notes payable	495,705		57,748		440,840
Repayment of notes payable	(627,623)		(306,692)		(503,705)
Distributions to common shareholders, perpetual preferred units, and noncontrolling interests	(152,242)		(135,626)		(152,687)
Payment of deferred financing costs	(9,288)		(6,564)		(5,124)
Common share options exercised	11,397		1,435		620
Net decrease in accounts receivable - affiliates	860		4,217		909
Other	1,734		1,064		612
Net cash from financing activities	(172,886)		(152,767)		(91,423)
Net increase (decrease) in cash and cash equivalents	(115,416)		106,419		56,749
Cash and cash equivalents, beginning of year	170,575		64,156		7,407
Cash and cash equivalents, end of year	55,159		170,575		64,156
Supplemental information
Cash paid for interest, net of interest capitalized	114,615		128,742		134,266
Cash paid for income taxes	2,664		1,169		1,654
Supplemental schedule of non-cash investing and financing activities
Distributions declared but not paid	39,364		35,295		33,025
Value of shares issued under benefit plans, net of cancellations	18,629		14,401		6,653
Conversion of operating partnership units to common shares	592		3,536		3,753
Accrual associated with construction and capital expenditures	16,754		6,590		5,189
Conversion of mezzanine notes to joint venture equity			43,279		18,496
Change of fair value of available-for-sale investments, net of tax			3,306
Consolidation of joint venture at fair value, net of cash
Real estate assets			238,885
In-place leases			4,962
Other assets			1,135
Mortgage debt assumed			188,119
Other liabilities			$ 3,197

[1] Equity in income (loss) of unconsolidated joint ventures excludes our ownership interest of fee income from various property management services and interest income from mezzanine loans with our joint ventures.

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Common shares, par value, per share	$ 0.01	$ 0.01
Common shares, authorized	100,000	100,000
Common shares, issued	87,377	85,130
Common shares, outstanding	84,517	82,386
Treasury shares, at cost	12,509	12,766

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Derivative Instruments And Hedging Activities

12 Months Ended

Dec. 31, 2011

Derivative Instruments And Hedging Activities [Abstract]

Derivative Instruments And Hedging Activities

10. Derivative Financial Instruments and Hedging Activities

Risk Management Objective of Using Derivatives. We are exposed to certain risks arising from both our business operations and economic conditions. We principally manage our exposures to a wide variety of business and operational risks through management of our core business activities. We manage economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of our debt funding and the use of derivative financial instruments. Specifically, we may enter into derivative financial instruments to manage exposures arising from business activities resulting in differences in the amount, timing, and duration of our known or expected cash payments principally related to our borrowings.

Cash Flow Hedges of Interest Rate Risk. Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish these objectives, we primarily use interest rate swaps and caps as part of our interest rate risk management strategy. Interest rate swaps involve the receipt of variable rate amounts from a counterparty in exchange for us making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps involve the receipt of variable rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an upfront premium.

Designated Hedges. In August 2011, our interest rate swap, with a notional amount of $16.6 million, matured and settled. As a result of the settlement, we did not have any designated hedges as of December 31, 2011. The effective portion of changes in the fair value of derivatives designated and qualifying as cash flow hedges is recorded in accumulated other comprehensive income or loss and is subsequently reclassified into earnings in the period the hedged forecasted transaction affects earnings. During the years ending December 31, 2011 and 2010, such derivatives were used to hedge the variable cash flows associated with existing variable rate debt. The ineffective portion of the change in fair value of the derivatives, if any, is recognized directly in earnings. No portion of designated hedges was ineffective during the years ended December 31, 2011, 2010, and 2009.

Non-designated Hedges. Derivatives are not entered into for speculative purposes and are used to manage our exposure to interest rate movements and other identified risks. Our non-designated hedges are either specifically non-designated by management or do not meet strict hedge accounting requirements. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings in other income or other expense.

In connection with the repayment of the $500 million term loan on June 6, 2011, we discontinued the hedging relationship on a $500 million interest rate swap used as a cash flow hedge as of May 31, 2011. Upon repayment of the loan, which eliminated the probable future variable monthly interest payments that were being hedged, we recognized a non-cash charge of approximately $29.8 million which included the accelerated reclassification of amounts previously recorded in accumulated other comprehensive loss related to this swap. Subsequent changes in the market value of the interest rate swap, which matures in October 2012, will be recorded directly in earnings over the remaining life of the swap in interest and other income. Due to, among other matters, the relatively short remaining life of the swap (which matures in October 2012) and the low expectation of the swap becoming a significantly larger liability, management elected to leave this interest rate swap in place through its original maturity rather than cash settle the swap.

As of December 31, 2011, we had the following outstanding interest rate derivatives which were not designated as hedges of interest rate risk:

	September 30,	September 30,
Interest Rate Derivative	Number of Instruments	Notional Amount
Interest Rate Cap	1	$175.0 million
Interest Rate Swap	1	$500.0 million

The table below presents the fair value of our derivative financial instruments as well as their classification in the consolidated balance sheets at December 31 (in millions):

September 30,

September 30,

September 30,

September 30,

September 30,

September 30,

September 30,

September 30,

September 30,

Fair Values of Derivative Instruments

Asset Derivatives

Liability Derivatives

2011

2010

2011

2010

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Derivatives designated as hedging instruments

Interest Rate Swaps

Other Liabilities

$

—

Other Liabilities

$

36.9

Derivatives designated not as hedging instruments

Interest Rate Swap

Other Liabilities

$

16.6

Other Liabilities

$

—

Interest Rate Cap

Other Assets

$

0.1

Other Assets

$

—

The tables below present the effect of our derivative financial instruments in the consolidated statements of income (loss) and comprehensive income for the years ended December 31 (in millions).

Effect of Derivative Instruments
Derivatives in Cash Flow Hedging Relationships	Unrealized Loss Recognized in Other Comprehensive Income ("OCI") on Derivative (Effective Portion)									Location of Loss Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)						Location of Loss Recognized in Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Loss Recognized in Statement of Income (Discontinuation, Ineffective Portion and Amount Excluded from Effectiveness Testing)
	2011			2010			2009				2011		2010		2009			2011		2010
Interest Rate Swaps (1)	$	(2.7	)	$	(19.1	)	$	(12.3	)	Interest Expense	$	9.9	$	23.4	$	22.2	Loss on discontinuation of hedging relationship	$	29.8	$	—

	September 30,		September 30,			September 30,		September 30,
Derivatives Not Designated as Hedging Instruments	Location of Income (Loss) Recognized in Statement of Income	Amount of Income (Loss) Recognized in Statement of Income
		2011			2010		2009
Interest Rate Cap	Other income/(loss)	$	(0.1	)	$	—	$	—
Interest Rate Swap	Other income/(loss)		(0.2	)		—		—

(1) The results include the interest rate swap gain (loss) prior to discontinuation in May 2011.

Credit-risk-related Contingent Features. Derivative financial investments expose us to credit risk in the event of non-performance by the counterparties under the terms of the interest rate hedge agreements. We believe we minimize our credit risk on these transactions by transacting with major creditworthy financial institutions. As part of our on-going control procedures, we monitor the credit ratings of counterparties and our exposure to any single entity, which we believe minimizes credit risk concentration.

Our agreements with each of our derivative counterparties contain provisions which provide the counterparty the right to declare a default on our derivative obligations if we are in default on any of our indebtedness, subject to certain thresholds. For all instances, these provisions include a default even if there is no acceleration of the indebtedness. Our agreements with each of our derivative counterparties also provide if we consolidate with, merge with or into, or transfer all or substantially all our assets to another entity and the creditworthiness of the resulting, surviving, or transferee entity is materially weaker than ours, the counterparty has the right to terminate the derivative obligations.

At December 31, 2011, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk (the "termination value"), related to these agreements was approximately $18.2 million. As of December 31, 2011, we had not posted any collateral related to these agreements. If we were in breach of any of these provisions at December 31, 2011, or terminated these agreements, we would have been required to settle our obligations at their aggregate termination value of approximately $18.2 million.

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Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2011	Feb. 10, 2012	Jun. 30, 2011
Document And Entity Information [Abstract]
Entity Registrant Name	CAMDEN PROPERTY TRUST
Entity Central Index Key	0000906345
Document Type	10-K
Document Period End Date	Dec. 31, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		78,804,181
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 4,418,001,069

XML

Share-Based Compensation And Benefit Plans

12 Months Ended

Dec. 31, 2011

Share-Based Compensation And Benefit Plans [Abstract]

Share-Based Compensation And Benefit Plans

11. Share-based Compensation and Benefit Plans

Incentive Compensation. During the second quarter of 2011, our Board of Trust Managers adopted, and on May 11, 2011 our shareholders approved, the 2011 Share Incentive Plan of Camden Property Trust (the "2011 Share Plan"). Under the 2011 Share Plan, we may issue up to a total of approximately 9.1 million fungible units (the "Fungible Pool Limit"), which is comprised of approximately 5.8 million new fungible units plus approximately 3.3 million fungible units previously available for issuance under our 2002 share incentive plan based on a 3.45 to 1.0 fungible unit-to full value award conversion ratio. Fungible units represent the baseline for the number of shares available for issuance under the 2011 Share Plan. Different types of awards are counted differently against the Fungible Pool Limit, as follows:

• Each share issued or to be issued in connection with an award, other than an option, right or other award which does not deliver the full value at grant of the underlying shares, will be counted against the Fungible Pool Limit as 3.45 fungible pool units;

• Options and other awards which do not deliver the full value at grant of the underlying shares and which expire more than five years from date of grant will be counted against the Fungible Pool Limit as one fungible pool unit; and

• Options, rights and other awards which do not deliver the full value at date of grant and expire five years or less from the date of grant will be counted against the Fungible Pool Limit as 0.83 of a fungible pool unit.

As of December 31, 2011, approximately 9.1 million fungible units were available under the 2011 Share Plan, which results in approximately 2.6 million common shares which could be granted pursuant to full value awards based on the 3.45 to 1.0 fungible unit-to-full value award conversion ratio.

Awards which may be granted under the 2011 Share Plan include incentive share options, non-qualified share options (which may be granted separately or in connection with an option), share awards, dividends and dividend equivalents and other equity based awards. Persons eligible to receive awards under the 2011 Share Plan are trust managers, directors of our affiliates, executive and other officers, key employees and consultants, as determined by the Compensation Committee of our Board of Trust Managers. The 2011 Share Plan will expire on May 11, 2021.

Options. Options are exercisable, subject to the terms and conditions of the plan, in increments ranging from 20% to 33.33% per year on each of the anniversaries of the date of grant. The plan provides that the exercise price of an option will be determined by the Compensation Committee of the Board of Trust Managers on the day of grant, and to date all options have been granted at an exercise price that equals the fair market value on the date of grant. Options exercised during 2011 were exercised at prices ranging from $30.06 to $62.32 per option. At December 31, 2011, outstanding options and exercisable options had a weighted average remaining life of approximately 4.7 years and 3.5 years, respectively.

The total intrinsic value of options exercised was approximately $9.6 million, $1.5 million, and $0.1 million during the years ended December 31, 2011, 2010 and 2009, respectively. As of December 31, 2011, there was approximately $1.3 million of total unrecognized compensation cost related to unvested options, which is expected to be amortized over the next three years.

The following table summarizes outstanding share options and exercisable options at December 31, 2011:

		September 30,		September 30,		September 30,		September 30,
	Outstanding Options (1)				Exercisable Options (1)
Range of Exercise Prices	Number		Weighted Average Price		Number		Weighted Average Price
$30.06-$41.16		470,019	$	32.06		176,314	$	35.39
$42.90-$45.53		466,060		44.32		428,797		44.36
$48.02-$73.32		403,457		51.79		253,068		54.03
Total options		1,339,536	$	42.27		858,179	$	45.37

(1) The aggregate intrinsic value of outstanding and exercisable options at December 31, 2011 was approximately $27.0 million and $14.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $62.24 per share on December 31, 2011 and the strike price of the underlying award.

Valuation Assumptions. Options generally have a vesting period of three to five years. We estimate the fair values of each option award on the date of grant using the Black-Scholes option pricing model. No new options were granted in 2011.

The following assumptions were used for options granted during each respective period:

	September 30,		September 30,
	Year Ended December 31,
	2010	2009
Weighted average fair value of options granted	$11.69	$	3.06
Expected volatility	35.6% – 39.2%		33.0	%
Risk-free interest rate	3.6% – 3.7%		2.6	%
Expected dividend yield	4.1% – 4.4%		9.3	%
Expected life (in years)	7– 9		7

Our computations of expected volatility for 2010 and 2009 are based on the historical volatility of our common shares over a time period equal to the expected life of the option and ending on the grant date. The interest rate for periods within the contractual life of the award is based on the U.S. Treasury yield curve in effect at the time of grant. The expected dividend yield on our common shares is estimated using the annual dividends paid in the prior year and the market price on the date of grant. Our computations of expected life for 2010 and 2009 are estimated based on historical experience of similar awards, giving consideration to the contractual terms of the share-based awards.

Share Awards and Vesting. Share awards generally have a vesting period of five years. The compensation cost for share awards is based on the market value of the shares on the date of grant and is amortized over the vesting period. To estimate forfeitures, we use actual forfeiture history. At December 31, 2011, the unamortized value of previously issued unvested share awards was approximately $27.3 million which is expected to be amortized over the next four years. The total fair value of shares vested during the years ended December 31, 2011, 2010, and 2009 was approximately $11.5 million, $10.6 million, and $10.2 million, respectively. At December 31, 2011, there were approximately 2.6 million full value share awards available for issuance.

Total compensation cost for option and share awards charged against income was approximately $12.3 million, $11.7 million, and $8.7 million for 2011, 2010, and 2009, respectively. Total capitalized compensation cost for option and share awards was approximately $0.9 million, $1.0 million, and $1.7 million for 2011, 2010 and 2009, respectively.

The following table summarizes activity under our share incentive plans for the three years ended December 31:

		September 30,			September 30,		September 30,			September 30,
	Options Outstanding			Weighted Average Exercise  / Grant Price		Nonvested Share Awards Outstanding			Weighted Average Exercise  / Grant Price
Options and nonvested share awards outstanding at December 31, 2008		1,536,527		$	44.96		520,285		$	59.40
2009 Activity:
Granted		489,509			30.06		329,018			30.11
Exercised/Vested		(18,521	)		33.45		(188,892	)		53.76
Forfeited		(24,157	)		45.08		(65,258	)		51.06
Net activity		446,831					74,868
Balance at December 31, 2009		1,983,358		$	41.39		595,153		$	46.20
2010 Activity:
Granted		55,895			43.94		372,661			40.05
Exercised/Vested		(141,213	)		32.54		(214,923	)		49.17
Forfeited		(50,904	)		46.65		(11,386	)		39.64
Net activity		(136,222	)				146,352
Balance at December 31, 2010		1,847,136		$	42.37		741,505		$	42.16
2011 Activity:
Granted		—			—		347,084			57.00
Exercised/Vested		(504,838	)		42.59		(243,874	)		47.19
Forfeited		(2,762	)		48.02		(25,961	)		44.51
Net activity		(507,600	)				77,249
Total options and nonvested share awards outstanding at December 31, 2011		1,339,536		$	42.27		818,754		$	46.88

Employee Share Purchase Plan ("ESPP"). We have established an ESPP for all active employees and officers who have completed one year of continuous service. Participants may elect to purchase our common shares through payroll deductions and/or through semi-annual contributions. At the end of each six-month offering period, each participant's account balance is applied to acquire common shares at 85% of the market value, as defined, on the first or last day of the offering period, whichever price is lower. We currently use treasury shares to satisfy ESPP share requirements. Each participant must hold the shares purchased for nine months in order to receive the discount, and a participant may not purchase more than $25,000 in value of shares during any plan year, as defined. The following table presents information related to our ESPP:

		September 30,		September 30,		September 30,
	2011		2010		2009
Shares purchased		19,914		29,100		34,649
Weighted average fair value of shares purchased	$	63.29	$	50.70	$	35.68
Expense recorded (in millions)	$	0.3	$	0.5	$	0.4

In January 2012, approximately 4,721 shares were purchased under the ESPP related to the 2011 plan year.

Rabbi Trust. We established a rabbi trust for a select group of participants in which share awards granted under the share incentive plan and salary and other cash amounts earned may be deposited. The rabbi trust is an irrevocable trust and no portion of the trust fund may be used for any purpose other than the delivery of those assets to the participants. The assets held in the rabbi trust are subject to the claims of our general creditors in the event of bankruptcy or insolvency. The rabbi trust is in use only for deferrals made prior to 2005, including bonuses related to service in 2004 but paid in 2005.

The value of the assets of the rabbi trust is consolidated into our financial statements based on GAAP. Granted share awards held by the rabbi trust are classified in equity in a manner similar to the manner in which treasury stock is accounted. Subsequent changes in the fair value of the shares are not recognized. The deferred compensation obligation is classified as an equity instrument and changes in the fair value of the amount owed to the

participant are not recognized. At December 31, 2011 and 2010, approximately 2.0 million share awards were held in the rabbi trust. Additionally, as of December 31, 2011 and 2010, the rabbi trust held trading securities totaling approximately $45.2 million and $53.1 million, respectively, which represents cash deferrals made by plan participants. Market value fluctuations on these trading securities are recognized in income in accordance with GAAP and the liability due to participants is adjusted accordingly.

At December 31, 2011 and 2010, approximately $28.7 million and $31.4 million, respectively, was required to be paid to us by plan participants upon the withdrawal of any assets from the rabbi trust, and is included in "Accounts receivable-affiliates" in our consolidated financial statements.

Non-Qualified Deferred Compensation Plan. The Non-Qualified Deferred Compensation Plan (the "Plan"), effective December 1, 2004, is an unfunded arrangement established and maintained primarily for the benefit of a select group of participants. Eligible participants shall commence participation in the Plan on the date the deferral election first becomes effective. We will credit to the participant's account an amount equal to the amount designated as the participant's deferral for the plan year as indicated in the participant's deferral election(s). Any modification to or termination of the Plan will not reduce a participant's right to any vested amounts already credited to his or her account. At December 31, 2011 and 2010, approximately 0.9 million and 0.7 million share awards, respectively, were held in the Plan. Additionally, as of December 31, 2011 and 2010, the Plan held trading securities totaling approximately $14.5 million and $14.3 million, respectively, which represents cash deferrals made by plan participants. Market value fluctuations on these trading securities are recognized in income in accordance with GAAP and the liability due to participants is adjusted accordingly.

401(k) Savings Plan. We have a 401(k) savings plan, which is a voluntary defined contribution plan. Under the savings plan, every employee is eligible to participate, beginning on the date the employee has completed six months of continuous service with us. Each participant may make contributions to the savings plan by means of a pre-tax salary deferral, which may not be less than 1% or more than 60% of the participant's compensation. The federal tax code limits the annual amount of salary deferrals which may be made by any participant. We may make matching contributions on the participant's behalf up to a predetermined limit. The matching contribution made for the year ended December 31, 2011 was approximately $1.8 million, and was approximately $1.3 million for each of the years ended December 31, 2010 and 2009. A participant's salary deferral contribution is 100% vested and nonforfeitable. A participant will become vested in our matching contributions 33% after one year of service, 67% after two years of service and 100% after three years of service. Administrative expenses under the savings plan were paid by us and were not significant for all periods presented.

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Schedule III - Real Estate And Accumulated Depreciation (Changes In Total Real Estate Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule III - Real Estate And Accumulated Depreciation [Abstract]
Balance, beginning of period	$ 5,647,677	$ 5,461,626	$ 5,455,834
Acquisition		238,885
Development	180,028	21,798	36,495
Improvements	61,037	44,405	35,377
Classification from held for sale			9,518
Cost of real estate sold contributed to joint venture	(12,578)	(119,037)	(3,345)
Cost of real estate sold, other	(32,673)
Impairment			(72,253)
Classification to held for sale	(23,951)
Balance, end of period	$ 5,819,540	$ 5,647,677	$ 5,461,626

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Consolidated Statements Of Income (Loss) And Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Property revenues
Rental revenues	$ 563,010		$ 516,908		$ 519,637
Other property revenues	92,858		84,542		83,011
Total property revenues	655,868	[1]	601,450	[1]	602,648
Property expenses
Property operating and maintenance	187,587		175,926		168,773
Real estate taxes	69,092		66,986		68,826
Total property expenses	256,679		242,912		237,599
Non-property income
Fee and asset management	9,973		8,172		8,008
Interest and other income	4,649		8,584		2,826
Income on deferred compensation plans	6,773		11,581		14,609
Total non-property income	21,395		28,337		25,443
Other expenses
Property management	20,686		19,982		18,864
Fee and asset management	5,935		4,841		4,878
General and administrative	35,456		30,762		31,243
Interest	112,414		125,893		128,296
Depreciation and amortization	179,867		170,362		168,845
Amortization of deferred financing costs	5,877		4,102		3,925
Expense on deferred compensation plans	6,773		11,581		14,609
Total other expenses	367,008		367,523		370,660
Loss on discontinuation of hedging relationship	(29,791)
Gain on sale of properties, including land	4,748		236
Gain on sale of unconsolidated joint venture interests	1,136
Loss on early retirement of debt					(2,550)
Impairment associated with land development activities					(85,614)
Impairment provision on a technology investment			(1,000)
Equity in income (loss) of joint ventures	5,679	[2]	(839)	[2]	695	[2]
Income (loss) from continuing operations before income taxes	35,348		17,749		(67,637)
Income tax expense - current	(2,220)		(1,581)		(967)
Income (loss) from continuing operations	33,128		16,168		(68,604)
Income from discontinued operations	2,212		5,360		7,514
Gain on sale of discontinued operations, net of tax	24,621		9,614		16,887
Net income (loss)	59,961		31,142		(44,203)
Less (income) loss allocated to noncontrolling interests from continuing operations	(3,582)		(926)		403
Less income allocated to perpetual preferred units	(7,000)		(7,000)		(7,000)
Net income (loss) attributable to common shareholders	49,379	[1]	23,216	[1]	(50,800)
Earnings per share - basic
Income (loss) from continuing operations attributable to common shareholders	$ 0.30		$ 0.11		$ (1.19)
Income from discontinued operations, including gain on sale, attributable to common shareholders	$ 0.37		$ 0.22		$ 0.39
Net income (loss) attributable to common shareholders	$ 0.67	[1]	$ 0.33	[1]	$ (0.80)
Earnings per share - diluted
Income (loss) from continuing operations attributable to common shareholders	$ 0.30		$ 0.11		$ (1.19)
Income from discontinued operations, including gain on sale, attributable to common shareholders - per share	$ 0.36		$ 0.22		$ 0.39
Net income (loss) attributable to common shareholders	$ 0.66	[1]	$ 0.33	[1]	$ (0.80)
Weighted average number of common shares outstanding - basic	72,756		68,608		62,359
Weighted average number of common shares outstanding - diluted	73,701		68,957		62,359
Net income (loss) attributable to common shareholders
Income (loss) from continuing operations	33,128		16,168		(68,604)
Less (income) loss allocated to noncontrolling interests from continuing operations	(3,582)		(926)		403
Less income allocated to perpetual preferred units	(7,000)		(7,000)		(7,000)
Income (loss) from continuing operations attributable to common shareholders	22,546		8,242		(75,201)
Income from discontinued operations, including gain on sale, attributable to common shareholders	26,833		14,974		24,401
Net income (loss) attributable to common shareholders	49,379	[1]	23,216	[1]	(50,800)
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	59,961		31,142		(44,203)
Other comprehensive income (loss)
Unrealized loss on cash flow hedging activities	(2,692)		(19,059)		(12,291)
Reclassification of net losses on cash flow hedging activities	39,657		23,385		22,192
Unrealized gain on available-for-sale securities, net of tax			3,306
Reclassification of gain on available-for-sale investment to earnings, net of tax	(3,306)
Unrealized gain (loss) and unamortized prior service cost on postretirement obligations	(884)		65
Comprehensive income (loss)	92,736		38,839		(34,302)
Less (income) loss allocated to noncontrolling interests from continuing operations	(3,582)		(926)		403
Less income allocated to perpetual preferred units	(7,000)		(7,000)		(7,000)
Comprehensive income (loss) attributable to common shareholders	$ 82,154		$ 30,913		$ (40,899)

[1] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

[2] Equity in income (loss) of unconsolidated joint ventures excludes our ownership interest of fee income from various property management services and interest income from mezzanine loans with our joint ventures.

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Operating Partnerships

12 Months Ended

Dec. 31, 2011

Operating Partnerships [Abstract]

Operating Partnerships

5. Operating Partnerships

At December 31, 2011, approximately 10% of our multifamily apartment homes were held in Camden Operating, L.P ("Camden Operating" or the "operating partnership"). Camden Operating has issued both common and preferred limited partnership units. As of December 31, 2011, we held 89.8% of the common limited partnership units and the sole 1% general partnership interest of the operating partnership. The remaining common limited partnership units, comprising approximately 1.1 million units, are primarily held by former officers, directors, and investors of Paragon Group, Inc., which we acquired in 1997. Each common limited partnership unit is redeemable for one common share of Camden or cash at our election. Holders of common limited partnership units are not entitled to rights as shareholders prior to redemption of their common limited partnership units. No member of our management owns Camden Operating common limited partnership units, and one of our ten trust managers own Camden Operating common limited partnership units.

Camden Operating has $100.0 million of 7.0% Series B Cumulative Redeemable Perpetual Preferred Units outstanding. Distributions on the preferred units are payable quarterly in arrears. The Series B preferred units were redeemable beginning in December 2008 by the operating partnership for cash at par plus the amount of any accumulated and unpaid distributions. There were no redemptions as of December 31, 2011. The preferred units are convertible beginning in 2015 by the holder into a fixed number of corresponding Series B Cumulative Redeemable Perpetual Preferred Shares of Camden. The Series B preferred units are subordinate to present and future debt. In February 2012, we redeemed the 4.0 million outstanding 7.0% Series B Cumulative Redeemable Perpetual Preferred Units at their redemption price of $25.00 per unit, or an aggregate of $100.0 million, plus accrued and unpaid distributions. In connection with this redemption, we expensed the unamortized issuance costs relating to these Series B units, which will result in a charge to earnings of approximately $2.1 million in the first quarter of 2012.

We hold the controlling managing member interest in Oasis Martinique, LLC, which owns one property in Orange County, California and is included in our consolidated financial statements. The remaining interests, comprising approximately 0.3 million units, are exchangeable into approximately 0.2 million of our common shares. In January 2012, approximately 0.2 million units were converted into approximately 0.1 million common shares.

At December 31, 2011, approximately 23% of our multifamily apartment homes were held in Camden Summit Partnership, L.P. (the "Camden Summit Partnership"). The Camden Summit Partnership has issued common limited partnership units. As of December 31, 2011, we held 94.1% of the common limited partnership units and the sole 1% general partnership interest of the Camden Summit Partnership. The remaining common limited partnership units, comprising approximately 1.1 million units, are primarily held by former officers, directors, and investors of Summit Properties Inc. ("Summit"), a company we acquired in 2005. Each common limited partnership unit is redeemable for one common share of Camden or cash at our election. Holders of common limited partnership units are not entitled to rights as shareholders prior to redemption of their common limited partnership units. No member of our management owns Camden Summit Partnership common limited partnership units, and two of our ten trust managers own Camden Summit Partnership common limited partnership units.

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Common Shares

12 Months Ended

Dec. 31, 2011

Common Shares [Abstract]

Common Shares

4. Common Shares

In March 2010, we announced the creation of an at-the-market ("ATM") share offering program through which we could, but had no obligation to, sell common shares having an aggregate offering price of up to $250 million ("2010 ATM program"), in amounts and at times as we determined, into the existing trading market at current market prices as well as through negotiated transactions. The 2010 ATM program has been terminated and no further common shares are available for sale under the 2010 ATM program.

The following table presents activity under our 2010 ATM share offering program for the periods presented (in thousands, except per share amounts):

		September 30,		September 30,
	Year Ended December 31,
	2011		2010
Total net consideration	$	13,847.0	$	231,650.5
Common shares sold		252.5		4,867.7
Average price per share	$	55.81	$	48.37

In May 2011, we created a second ATM share offering program through which we can sell common shares having an aggregate offering price of up to $300 million ("2011 ATM program") from time to time into the existing trading market at current market prices as well as through negotiated transactions. We may, but have no obligation to, sell common shares through the 2011 ATM share offering program in amounts and at times as we determine. Actual sales from time to time may depend on a variety of factors, including, among others, market conditions, the trading price of our common shares, and determination of the appropriate sources of funding for us.

The following table presents activity under our 2011 ATM program for the period presented (in thousands, except per share amounts):

		September 30,
	Year Ended December 31, 2011
Total net consideration	$	92,723.6
Common shares sold		1,498.5
Average price per share	$	62.98

During January of 2012, we sold approximately 0.1 million common shares under the 2011 ATM program at an average price of $62.41 per share for total net consideration of approximately $3.2 million. As of the date of filing, we had common shares having an aggregate offering price of up to $202.4 million remaining available for sale under the 2011 ATM program.

In January 2008, our Board of Trust Managers approved an increase of the April 2007 repurchase plan to allow for the repurchase of up to $500 million of our common equity securities through open market purchases, block purchases, and privately negotiated transactions. Under this program, we have repurchased 4.3 million shares for a total of approximately $230.2 million from April 2007 through December 31, 2011. The remaining dollar value of our common equity securities authorized to be repurchased under the program was approximately $269.8 million as of December 31, 2011. There were no repurchases of our equity securities during the years ended December 31, 2011, 2010 and 2009.

We currently have an automatic shelf registration statement on file with the Securities and Exchange Commission which allows us to offer, from time to time, an unlimited amount of common shares, preferred shares, debt securities, or warrants. Our declaration of trust provides we may issue up to 110.0 million shares of beneficial interest, consisting of 100.0 million common shares and 10.0 million preferred shares. As of December 31, 2011, we had approximately 72.0 million common shares outstanding, net of treasury shares and shares held in our deferred compensation arrangements, and no preferred shares outstanding. In January 2012, we issued 6,612,500 common shares in a public equity offering and received approximately $391.6 million in net proceeds. We utilized these proceeds to fund the acquisition of the 80% interest not owned by us in twelve related joint ventures. See Note 8 "Investments in Joint Ventures" for further discussion of this transaction.

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Noncontrolling Interests

12 Months Ended

Dec. 31, 2011

Noncontrolling Interests [Abstract]

Noncontrolling Interests

16. Noncontrolling Interests

The following table summarizes the effect of changes in our ownership interest in subsidiaries on the equity attributable to common shareholders for each of the years ended December 31:

		September 30,		September 30,		September 30,
	2011		2010		2009
Net income (loss) attributable to common shareholders	$	49,379	$	23,216	$	(50,800	)
Transfers from the noncontrolling interests:
Increase in equity for conversion of operating partnership units		592		3,528		3,761
Increase in equity from purchase of noncontrolling interests		—		—		647
Change in common equity and net transfers from noncontrolling interests	$	49,971	$	26,744	$	(46,392	)

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Fair Value Measurements

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Fair Value Measurements

12. Fair Value Measurements

The following table presents information about our financial assets and liabilities measured at fair value as of December 31, 2011 and 2010 under the fair value hierarchy discussed in Footnote 2, "Summary of Significant Accounting Policies and Recent Accounting Pronouncements":

Assets and Liabilities Measured at Fair Value on a Recurring Basis

(in millions)

		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,		September 30,
	December 31, 2011								December 31, 2010
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Deferred compensation plan investments	$	41.0	$	—	$	—	$	41.0	$	46.7	$	—	$	—	$	46.7
Available-for-sale investment		—		—		—		—		5.0		—		—		5.0
Derivative financial instruments		—		0.1		—		0.1		—		—		—		—
Liabilities
Derivative financial instruments	$	—	$	16.6	$	—	$	16.6	$	—	$	36.9	$	—	$	36.9

Other Fair Value Disclosures. As of December 31, 2011 and 2010, the carrying value of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accrued expenses and other liabilities, and distributions payable approximated fair value based on the short-term nature of these instruments.

In calculating the fair value of our notes receivable and notes payable, interest rates and spreads reflect current creditworthiness and market conditions available for the issuance of notes receivable and notes payable with similar terms and remaining maturities. The following table presents the carrying and estimated fair value of our notes receivable and notes payable for the years ended December 31:

		September 30,		September 30,		September 30,		September 30,
	December 31, 2011				December 31, 2010
(in millions)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Notes receivable – affiliates	$	—	$	—	$	3.2	$	3.2
Fixed rate notes payable (1)		2,186.6		2,304.4		2,333.5		2,386.0
Floating rate notes payable		245.5		233.6		230.3		212.7

(1) December 31, 2010 includes a $500 million term loan entered into in 2007, and a $16.6 million construction loan entered into in 2008 which are effectively fixed by the use of interest rate swaps but evaluated for estimated fair value at the floating rate. The $500 million term loan was repaid in June 2011. The $16.6 million construction loan interest rate swap matured and was not extended in conjunction with the one-year extension of the loan in July 2011.

Nonrecurring Fair Value Disclosures. Nonfinancial assets and nonfinancial liabilities measured on a nonrecurring basis utilizing level 3 inputs, primarily relate to impairment of long-lived assets or investments. There were no events during the years ended December 31, 2011 or 2010 which required fair value adjustments of our nonfinancial assets and nonfinancial liabilities.

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Investments In Joint Ventures

12 Months Ended

Dec. 31, 2011

Investments In Joint Ventures [Abstract]

Investments In Joint Ventures

8. Investments in Joint Ventures

As of December 31, 2011, our equity investments in unconsolidated joint ventures, which we account for utilizing the equity method of accounting, consisted of 17 joint ventures, with our ownership percentages ranging from 15% to 50%. We currently provide property management services to each of these joint ventures which own operating properties, and we may provide construction and development services to the joint ventures which own properties under development. The following table summarizes aggregate balance sheet and statement of income data for the unconsolidated joint ventures as of and for the periods presented (in millions):

	September 30,	September 30,		September 30,		September 30,
			2011		2010
Total assets			$	1,394.9	$	935.3
Total third-party debt				1,093.9		810.1
Total equity				261.6		105.3

		September 30,		September 30,	September 30,		September 30,
	2011			2010		2009
Total revenues	$	164.4		$137.6		$	137.3
Gain on sale of operating properties, net of tax		17.4		—			—
Net income (loss)		(3.2	)	(19.1)			(18.0	)
Equity in income (loss) (1)		5.7		(0.8)			0.7

(1) Equity in income (loss) of unconsolidated joint ventures excludes our ownership interest of fee income from various property management services and interest income from mezzanine loans with our joint ventures.

The joint ventures in which we have an interest have been funded in part with secured third-party debt. As of December 31, 2011, we had no outstanding guarantees related to loans of our unconsolidated joint ventures.

We may earn fees for property management, construction, development, and other services related to joint ventures in which we own an interest. Fees earned for these services, excluding third-party construction fees, amounted to approximately $9.3 million, $6.2 million, and $6.8 million for the years ended December 31, 2011, 2010, and 2009, respectively. We eliminate fee income for these services provided to these joint ventures to the extent of our ownership. Fees earned on third-party construction projects amounted to approximately $0.7 million, $2.0 million, and $1.2 million for the years ended December 31, 2011, 2010 and 2009, respectively.

During March 2011, we sold our ownership interests in three unconsolidated joint ventures for total proceeds of approximately $19.3 million and recognized a gain of approximately $1.1 million.

In April 2011, we sold one of our development properties in Washington, D.C. to one of our discretionary investment funds (the "Funds"), in which we have a 20% interest, for approximately $9.4 million and we were reimbursed for previously written-off third-party development costs, resulting in a gain of approximately $4.7 million. Additionally, in June 2011, we sold one of our development properties located in Austin, Texas to this Fund for approximately $3.1 million, resulting in a gain of approximately $0.1 million.

During the year ended December 31, 2011, the Funds also acquired eighteen multifamily properties comprised of 2,846 units located in Houston, Texas, 1,250 units located in Dallas, Texas, 768 units located in Austin, Texas, 450 units located in Tampa, Florida, 528 units located in San Antonio, Texas, and 234 units located in Atlanta, Georgia. In January 2012, one of the Funds acquired one multifamily property comprised of 350 units located in Raleigh, North Carolina.

During the fourth quarter of 2011, one of our unconsolidated joint ventures sold four operating properties consisting of 1,194 units located in Louisville, Kentucky. Our proportionate share of the gain was approximately $6.4 million, which was reported as a component of equity in income (loss) of joint ventures in the consolidated statements of income (loss) and comprehensive income.

In January 2012, we purchased the remaining 80% ownership interest in twelve unconsolidated joint ventures for approximately $99.5 million and assumed approximately $272.6 million in mortgage debt associated with these joint ventures. The purchase price and subsequent repayment of the mortgage debt was funded by proceeds received from a public equity offering as discussed in Note 4, "Common Shares." These joint ventures are comprised of 4,034 units located in Dallas, Houston, Las Vegas, Phoenix, and Southern California. We previously accounted for these joint ventures in accordance with the equity method of accounting as of December 31, 2011. Following the completion of this transaction, we will consolidate these entities for financial reporting purposes. As of the date of this filing, the initial accounting for the purchase price allocation has not been completed as we are awaiting the completion of our analysis of the net assets acquired which we expect to be completed by the end of the first quarter 2012.

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Derivative Instruments And Hedging Activities (Fair Value Of Derivative Financial Instruments And Their Classification In The Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 0.1
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value		36.9
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	16.6
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 0.1

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Income Taxes

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Income Taxes

6. Income Taxes

We have maintained and intend to maintain our election as a REIT under the Internal Revenue Code of 1986, as amended. In order for us to continue to qualify as a REIT we must meet a number of organizational and operational requirements, including a requirement to distribute annual dividends to our shareholders equal to a minimum of 90% of our REIT taxable income, computed without regard to the dividends paid deduction and our net capital gains. As a REIT, we generally will not be subject to federal income tax on our taxable income at the corporate level to the extent such income is distributed to our shareholders annually. If our taxable income exceeds our dividends in a tax year, REIT tax rules allow us to designate dividends from the subsequent tax year in order to avoid current taxation on undistributed income. If we fail to qualify as a REIT in any taxable year, we will be subject to federal and state income taxes at regular corporate rates, including any applicable alternative minimum tax. In addition, we may not be able to requalify as a REIT for the four subsequent taxable years. We historically have incurred only state and local income, franchise, and excise taxes. Taxable income from non-REIT activities managed through taxable REIT subsidiaries is subject to applicable federal, state, and local income and margin taxes. Our operating partnerships are flow-through entities and are not subject to federal income taxes at the entity level.

We have provided for income, franchise, and margin taxes in the consolidated statements of income (loss) and comprehensive income for the years ended December 31, 2011, 2010 and 2009. Income taxes for the year ended December 31, 2011 included approximately $1.0 million associated with the gain recognized by one of our taxable REIT subsidiaries on the sale of an available-for-sale investment in February 2011. Other income tax expense is related to entity level taxes on certain ventures, state taxes, and federal taxes on certain of our taxable REIT subsidiaries. We have no significant temporary differences or tax credits associated with our taxable REIT subsidiaries.

The following table reconciles net income to REIT taxable income for the years ended December 31:

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands)	2011			2010			2009
Net income (loss)	$	59,961		$	31,142		$	(44,203	)
Less (income) loss attributable to noncontrolling interests		(3,582	)		(926	)		403
Less income allocated to perpetual preferred units		(7,000	)		(7,000	)		(7,000	)
Net income (loss) attributable to common shareholders		49,379			23,216			(50,800	)
Loss of taxable REIT subsidiaries included above		539			2,056			25,124
Net income (loss) from REIT operations		49,918			25,272			(25,676	)
Book depreciation and amortization, including discontinued operations		188,042			179,662			178,607
Tax depreciation and amortization		(155,636	)		(158,134	)		(164,639	)
Book/tax difference on gains/losses from capital transactions		(4,315	)		37,798			(7,059	)
Book/tax difference on impairment associated with land development activities		—			—			62,397
Other book/tax differences, net		8,205			(10,565	)		(24,188	)
REIT taxable income		86,214			74,033			19,442
Dividends paid deduction		(143,657	)		(124,999	)		(128,507	)
Dividends paid in excess of taxable income	$	(57,443	)	$	(50,966	)	$	(109,065	)

A schedule of per share distributions we paid and reported to our shareholders is set forth in the following table:

		September 30,			September 30,			September 30,
	Year Ended December 31,
	2011			2010			2009
Common Share Distributions
Ordinary income	$	1.08		$	0.89		$	1.74
Long-term capital gain		0.13			0.20			0.25
Unrecaptured Sec. 1250 gain		0.23			0.48			0.06
Return of capital		0.52			0.23			—
Total	$	1.96		$	1.80		$	2.05
Percentage of distributions representing tax preference items		2.83	%		3.91	%		3.94	%

We have taxable REIT subsidiaries which are subject to federal and state income taxes. At December 31, 2011, our taxable REIT subsidiaries had net operating loss carryforwards ("NOL's") of approximately $29.0 million which expire in years 2019 to 2031. Because NOL's are subject to certain change of ownership, continuity of business, and separate return year limitations, and because it is unlikely the available NOL's will be utilized or because we consider any amounts possibly utilized to be immaterial, no benefits of these NOL's have been recognized in our consolidated financial statements.

The carrying value of net assets reported in our consolidated financial statements at December 31, 2011 exceeded the tax basis by approximately $972.8 million.

Income Tax Expense – Current. For the tax years ended December 31, 2011, 2010, and 2009, we had current income tax expense of approximately $2.2 million, $1.6 million, and $1.0 million, respectively. Income tax expense for the year ended December 31, 2011 included approximately $1.0 million associated with the gain recognized by one of our taxable REIT subsidiaries on the sale of an available-for-sale investment during 2011 and also were comprised of entity level state income taxes on certain ventures and federal income tax related to another one of our taxable REIT subsidiaries. The 2010 income tax expense was comprised mainly of entity level state income taxes on certain ventures and federal income tax related to one of our taxable REIT subsidiaries. The 2009 income tax expense was comprised mainly of state income taxes.

Income Tax Expense – Deferred. For the years ended December 31, 2011, 2010, and 2009, our deferred tax expense was not significant.

The company and its subsidiaries' income tax returns are subject to examination by federal, state and local tax jurisdictions for years 2008 through 2010. Net income tax loss carry forwards and other tax attributes generated in years prior to 2008 are also subject to challenge in any examination of those tax years. The company and its subsidiaries are not under any notice of audit from any taxing authority at year end 2011. We believe we have no uncertain tax positions or unrecognized tax benefits requiring disclosure for the periods presented.

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Property Acquisitions, Discontinued Operations, And Assets Held For Sale

12 Months Ended

Dec. 31, 2011

Property Acquisitions Discontinued Operation And Assets Held For Sale [Abstract]

Property Acquisitions, Discontinued Operations, And Assets Held For Sale

7. Property Acquisitions, Discontinued Operations, Assets Held for Sale, and Impairments

Acquisitions. During 2011, we acquired 30.1 acres of land located in Atlanta, Georgia for approximately $40.1 million and 2.2 acres of land in Glendale, California for approximately $21.4 million. We intend to utilize these land holdings for development of multiple multifamily apartment communities. We did not acquire any operating properties during the year ended December 31, 2011.

In August 2010, the ownership of one of our joint ventures, which owns a multifamily property located in Irvine, California, was restructured and resulted in our ownership interest increasing from 30% to 99.99%. We previously accounted for this joint venture in accordance with the equity method of accounting. Following this restructuring, we have consolidated this entity for financial reporting purposes. At the time of this restructuring, we recorded the assets and liabilities of the joint venture at fair value, which resulted in an increase of real estate assets of approximately $92.7 million and a reduction to investments in joint ventures and notes receivable-affiliates of approximately $21.2 million and $20.7 million, respectively. We did not record a gain or loss on this restructuring as the net consideration approximated the fair market value of the net assets received. Subsequent to this restructuring, we repaid the joint venture's existing $52.1 million secured note, which accrued interest at LIBOR plus 2.25%, and the joint venture entered into a 35 year secured credit agreement with a third-party lender in the amount of $53.0 million with an effective annual interest rate of approximately 4.35%.

In December 2010, the ownership of two of our joint ventures, which own multifamily properties located in Houston, Texas and College Park, Maryland, were restructured and resulted in our ownership interests increasing from 30% to 99.99%. We previously accounted for these joint ventures in accordance with the equity method of accounting. Following this restructuring, we have consolidated these entities for financial reporting purposes. At the time of this restructuring, we recorded the assets and liabilities of the joint ventures at fair value, which resulted in an increase of real estate assets of approximately $146.2 million and a reduction to investments in joint ventures and notes receivable-affiliates of approximately $2.4 million and $14.3 million, respectively. We did not record a gain or loss on this restructuring as the net consideration approximated the fair market value of the net assets received. Subsequent to this restructuring, we repaid one joint venture's existing $108.8 million secured note, which accrued interest at LIBOR plus 2.0%. Additionally, we assumed the debt of one of the joint venture's secured notes with third-party lenders for approximately $27.2 million, and repaid one of the secured notes for approximately $4.6 million. The remaining $22.6 million secured note matures in May 2019 and has an effective annual interest rate of 5.33%.

The three restructured joint ventures, discussed above, contributed revenues of approximately $2.6 million and earnings, which represent property revenues less property expenses, of approximately $1.5 million, from their respective consolidation dates through December 31, 2010. These three joint ventures contributed revenues and earnings of approximately $20.8 million and $12.6 million, respectively, during the year ended December 31, 2011.

The following unaudited pro forma summary presents consolidated information (as adjusted for discontinued operations in 2011) assuming the acquisition of control of the three joint ventures had occurred on January 1, 2009.

		September 30,		September 30,
	Pro Forma Year Ended December 31,
(in thousands)	2010		2009
	(unaudited)
Property revenues	$	618,611	$	621,101
Property operating income	$	368,264	$	375,252

Discontinued Operations and Assets Held for Sale. For the year ended December 31, 2011, income from discontinued operations included the results of operations of two operating properties, containing 788 apartment homes, sold in December 2011. For the years 2010 and 2009, income from discontinued operations also included the results of operations of two operating properties sold during 2010 and one operating property sold during 2009 through their sale dates.

For the years ended December 31, 2011, 2010 and 2009, income from discontinued operations also included the results of operations of one operating property, containing 357 apartment homes, classified as held for sale at December 31, 2011. This property was sold in January 2012 for approximately $24.5 million.

The following is a summary of income from discontinued operations for the years presented below:

		September 30,		September 30,		September 30,
	Year Ended December 31,
(in thousands)	2011		2010		2009
Property revenues	$	9,206	$	19,728	$	23,686
Property expenses		4,696		9,170		10,335
		4,510		10,558		13,351
Depreciation and amortization		2,298		5,198		5,837
Income from discontinued operations	$	2,212	$	5,360	$	7,514
Gain on sale of discontinued operations, net of tax	$	24,621	$	9,614	$	16,887

Impairment. The impairment associated with land development activities for the year ended December 31, 2009 totaled approximately $72.2 million representing the difference between the estimated fair value and the carrying value of various land holdings for development projects we either placed on hold or planned to not pursue.

Impairment for the year ended December 31, 2009 also included the write-off of $13.4 million of costs capitalized and exit costs associated with a land development joint venture we placed on hold. In the fourth quarter of 2010, this joint venture was dissolved.

During the fourth quarter of 2010, we wrote-off a $1.0 million investment associated with a technology investment which we determined was no longer recoverable.

There were no impairments for the year ended December 31, 2011.

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Notes Payable

12 Months Ended

Dec. 31, 2011

Notes Payable [Abstract]

Notes Payable

9. Notes Payable

The following is a summary of our indebtedness:

		September 30,		September 30,
	December 31,
(in millions)	2011		2010
Commercial Banks
Unsecured line of credit and short-term borrowings	$	—	$	—
Term loan, due 2012		—		500.0
	$	—	$	500.0
Senior unsecured notes
7.69% Notes, due 2011		—		88.0
5.93% Notes, due 2012		189.6		189.5
5.45% Notes, due 2013		199.7		199.6
5.08% Notes, due 2015		249.3		249.2
5.75% Notes, due 2017		246.2		246.1
4.70% Notes, due 2021		248.6		—
5.00% Notes, due 2023		247.3		—
		1,380.7		972.4
Medium-term notes
4.99% Notes, due 2011		—		35.4
Total unsecured notes payable		1,380.7		1,507.8
Secured notes
0.91% – 6.00% Conventional Mortgage Notes, due 2012 – 2045		1,012.3		1,015.7
1.59% Tax-exempt Mortgage Note, due 2028		39.1		40.3
		1,051.4		1,056.0
Total notes payable	$	2,432.1	$	2,563.8
Floating rate tax-exempt debt included in secured notes (1.59%)	$	39.1	$	40.3
Floating rate debt included in secured notes (0.91% – 1.73%)		206.4		189.9
Value of real estate assets, at cost, subject to secured notes		1,651.0		1,629.6

In September 2011, we amended our $500 million unsecured credit facility to extend the maturity date from August 2012 to September 2015 with an option to extend to September 2016. Additionally, we now have the option to increase this credit facility to $750 million by either adding additional banks to the credit facility or obtaining the agreement of existing banks to increase their commitments. The interest rate is based upon LIBOR plus a margin which is subject to change as our credit ratings change. Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates. These bid rate loans have terms of 180 days or less and may not exceed the lesser of $250 million or the remaining amount available under the line of credit. The line of credit is subject to customary financial covenants and limitations, all of which we are in compliance.

Our line of credit provides us with the ability to issue up to $100 million in letters of credit. While our issuance of letters of credit does not increase our borrowings outstanding under our line of credit, it does reduce the amount available. At December 31, 2011, we had outstanding letters of credit totaling approximately $10.4 million, leaving approximately $489.6 million available under our unsecured line of credit.

In June 2011, we issued from our existing shelf registration statement $250 million aggregate principal amount of 4.625% senior unsecured notes due June 2021 (the "2021 Notes") and $250 million aggregate principal amount of 4.875% senior unsecured notes due June 2023 (the "2023 Notes" and, together with the 2021 Notes, the "Notes"). The 2021 Notes were offered to the public at 99.404% of their face amount with a yield to maturity of 4.70% and the 2023 Notes were offered to the public at 98.878% of their face amount with a yield to maturity of 5.00%. We received net proceeds of approximately $491.8 million, net of underwriter discounts and other offering expenses. Interest on the Notes is payable semi-annually on June 15 and December 15, beginning December 15, 2011. We may redeem each series of Notes, in whole or in part, at any time at a redemption price equal to the principal amount and accrued interest of the notes being redeemed, plus a make-whole provision. If, however, we redeem Notes of either series 90 days or fewer prior to their maturity date, the redemption price will equal 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest on the amount being redeemed to the redemption date. Each series of Notes is a direct, senior unsecured obligation and ranks equally with each other and with all of our other unsecured and unsubordinated indebtedness. We used the proceeds from this offering, together with cash on hand, to repay our outstanding $500 million term loan. In conjunction with the repayment of the $500 million term loan, we expensed approximately $0.5 million of unamortized loan costs.

As part of the 2005 Summit merger, we assumed certain debt and recorded approximately $33.9 million as a fair value adjustment which is being amortized over the respective debt terms. As of December 31, 2011, the fair value adjustment was fully amortized. We recorded amortization of the fair value adjustment, which resulted in a decrease of interest expense of approximately $0.4 million, $1.1 million, and $2.3 million during the years ended December 31, 2011, 2010, and 2009, respectively.

At December 31, 2011 and 2010, the weighted average interest rate on our floating rate debt, which includes our unsecured line of credit, was approximately 1.1% and 1.3%, respectively.

Our indebtedness, including our unsecured line of credit, had a weighted average maturity of 6.8 years at December 31, 2011. Scheduled repayments on outstanding debt, including all contractual extensions which have been exercised, including our line of credit and scheduled principal amortizations, and the weighted average interest rate on maturing debt at December 31, 2011 were as follows:

		September 30,		September 30,
(in millions)	Amount		Weighted Average Interest Rate
2012	$	294.2		5.2	%
2013		228.0		5.4
2014		11.0		6.0
2015		252.4		5.1
2016 (1)		2.6		N/A
2017 and thereafter		1,643.9		4.6
Total	$	2,432.1		4.8	%

(1) Includes only scheduled principal amortizations.

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Share-Based Compensation And Benefit Plans (Assumptions Used For Options Granted) (Details) (USD $)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of options granted	$ 11.69	$ 3.06
Expected volatility, minimum	35.60%
Expected volatility, maximum	39.20%
Expected volatility		33.00%
Risk-free interest rate, minimum	3.60%
Risk-free interest rate, maximum	3.70%
Risk-free interest rate		2.60%
Expected dividend yield		9.30%
Expected life (in years), minimum	7
Expected life (in years), maximum	9
Expected life (in years)		7
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	4.10%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	4.40%

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Share-Based Compensation And Benefit Plans (Employee Share Purchase Plan Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Jan. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-Based Compensation And Benefit Plans [Abstract]
Shares purchased	4,721	19,914	29,100	34,649
Weighted average fair value of shares purchased		$ 63.29	$ 50.70	$ 35.68
Expense recorded		$ 0.3	$ 0.5	$ 0.4

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Share-Based Compensation And Benefit Plans (Summary Of Share Options Outstanding And Exercisable) (Details) (USD $) In Millions, except Share data, unless otherwise specified						12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2011 $30.06-$41.16 [Member]		Dec. 31, 2011 $42.90-$45.53 [Member]		Dec. 31, 2011 $48.02-$73.32 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Minimum						$ 30.06		$ 42.90		$ 48.02
Range of Exercise Prices, Maximum						$ 41.16		$ 45.53		$ 73.32
Outstanding Options, Number	1,339,536	[1]	1,847,136	1,983,358	1,536,527	470,019	[1]	466,060	[1]	403,457	[1]
Outstanding Options, Weighted Average Price	$ 42.27	[1]				$ 32.06	[1]	$ 44.32	[1]	$ 51.79	[1]
Exercisable Options, Number	858,179	[1]				176,314	[1]	428,797	[1]	253,068	[1]
Exercisable Options, Weighted Average Price	$ 45.37	[1]				$ 35.39	[1]	$ 44.36	[1]	$ 54.03	[1]
Aggregate intrinsic value of outstanding options	$ 27.0
Aggregate Intrinsic Value of Exercisable Options	$ 14.7
Closing share price per share for calculation of aggregate intrinsic values	$ 62.24

[1] The aggregate intrinsic value of outstanding and exercisable options at December 31, 2011 was approximately $27.0 million and $14.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $62.24 per share on December 31, 2011 and the strike price of the underlying award.

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Share-Based Compensation And Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Share-Based Compensation And Benefit Plans [Abstract]

Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value

		September 30,		September 30,		September 30,		September 30,
	Outstanding Options (1)				Exercisable Options (1)
Range of Exercise Prices	Number		Weighted Average Price		Number		Weighted Average Price
$30.06-$41.16		470,019	$	32.06		176,314	$	35.39
$42.90-$45.53		466,060		44.32		428,797		44.36
$48.02-$73.32		403,457		51.79		253,068		54.03
Total options		1,339,536	$	42.27		858,179	$	45.37

(1) The aggregate intrinsic value of outstanding and exercisable options at December 31, 2011 was approximately $27.0 million and $14.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $62.24 per share on December 31, 2011 and the strike price of the underlying award.

Assumptions Used For Options Granted

	September 30,		September 30,
	Year Ended December 31,
	2010	2009
Weighted average fair value of options granted	$11.69	$	3.06
Expected volatility	35.6% – 39.2%		33.0	%
Risk-free interest rate	3.6% – 3.7%		2.6	%
Expected dividend yield	4.1% – 4.4%		9.3	%
Expected life (in years)	7– 9		7

Summary Of Share Incentive Plans

		September 30,			September 30,		September 30,			September 30,
	Options Outstanding			Weighted Average Exercise  / Grant Price		Nonvested Share Awards Outstanding			Weighted Average Exercise  / Grant Price
Options and nonvested share awards outstanding at December 31, 2008		1,536,527		$	44.96		520,285		$	59.40
2009 Activity:
Granted		489,509			30.06		329,018			30.11
Exercised/Vested		(18,521	)		33.45		(188,892	)		53.76
Forfeited		(24,157	)		45.08		(65,258	)		51.06
Net activity		446,831					74,868
Balance at December 31, 2009		1,983,358		$	41.39		595,153		$	46.20
2010 Activity:
Granted		55,895			43.94		372,661			40.05
Exercised/Vested		(141,213	)		32.54		(214,923	)		49.17
Forfeited		(50,904	)		46.65		(11,386	)		39.64
Net activity		(136,222	)				146,352
Balance at December 31, 2010		1,847,136		$	42.37		741,505		$	42.16
2011 Activity:
Granted		—			—		347,084			57.00
Exercised/Vested		(504,838	)		42.59		(243,874	)		47.19
Forfeited		(2,762	)		48.02		(25,961	)		44.51
Net activity		(507,600	)				77,249
Total options and nonvested share awards outstanding at December 31, 2011		1,339,536		$	42.27		818,754		$	46.88

Employee Share Purchase Plan Activity

		September 30,		September 30,		September 30,
	2011		2010		2009
Shares purchased		19,914		29,100		34,649
Weighted average fair value of shares purchased	$	63.29	$	50.70	$	35.68
Expense recorded (in millions)	$	0.3	$	0.5	$	0.4

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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Pro Forma Consolidated Income Statement Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Property Acquisitions Discontinued Operation And Assets Held For Sale [Abstract]
Property revenues	$ 618,611	$ 621,101
Property operating income	$ 368,264	$ 375,252

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Commitments And Contingencies

12 Months Ended

Dec. 31, 2011

Commitments And Contingencies

Commitments And Contingencies

14. Commitments and Contingencies

Construction Contracts. As of December 31, 2011, we had approximately $180.0 million of additional anticipated expenditures on our construction projects currently under development. We expect to fund these amounts through a combination of available cash balances, cash flows generated from operations, draws on our unsecured credit facility, proceeds from property dispositions, and the use of debt and equity offerings under our automatic shelf registration statement.

Litigation. One of our wholly-owned subsidiaries previously acted as a general contractor for the construction of three apartment projects in Florida which were subsequently sold and converted to condominium units by unrelated third-parties. Each condominium association of those projects has asserted claims against our subsidiary alleging, in general, defective construction as a result of alleged negligence and an alleged failure to comply with building codes. On May 25, 2011, we mediated a pre-suit settlement agreement with one of the associations to resolve its alleged claims. Pursuant to this settlement agreement, we agreed to make a one-time payment to the association which was not material.

The other two associations have filed suit against our subsidiary and other unrelated third parties in Florida claiming damages, in unspecified amounts, for the costs of repair arising out of the alleged defective construction as well as the recovery of incidental and consequential damages resulting from such alleged negligence. The remaining two lawsuits are in a very early stage and no significant discovery has been conducted. While we have denied liability to the remaining associations, it is not possible to determine the potential outcome nor is it possible to estimate a range of the amount of loss, if any, that would be associated with any potential adverse decision as these matters are in a very early stage and the pre-suit settlement mentioned above does not provide any basis for estimating losses, if any, in these two lawsuits.

We are also subject to various legal proceedings and claims which arise in the ordinary course of business. Matters which arise out of allegations of bodily injury, property damage, and employment practices are generally covered by insurance. While the resolution of these legal proceedings and claims cannot be predicted with certainty, management believes the final outcome of such matters will not have a material adverse effect on our consolidated financial statements.

Other Contingencies. In the ordinary course of our business, we issue letters of intent indicating a willingness to negotiate for acquisitions, dispositions, or joint ventures and also enter into arrangements contemplating various transactions. Such letters of intent and other arrangements are non-binding as to either party unless and until a definitive contract is entered into by the parties. Even if definitive contracts relating to the purchase or sale of real property are entered into, these contracts generally provide the purchaser with time to evaluate the property and conduct due diligence, during which periods the purchaser will have the ability to terminate the contracts without penalty or forfeiture of any deposit or earnest money. There can be no assurance definitive contracts will be entered into with respect to any matter covered by letters of intent or we will consummate any transaction contemplated by any definitive contract. Furthermore, due diligence periods for real property are frequently extended as needed. An acquisition or sale of real property becomes probable at the time the due diligence period expires and the definitive contract has not been terminated. We are then at risk under a real property acquisition contract, but generally only to the extent of any earnest money deposits associated with the contract, and are obligated to sell under a real property sales contract.

Lease Commitments. At December 31, 2011, we had long-term leases covering office facilities and equipment. Rental expense totaled approximately $2.8, $2.9, and $3.0 million for the year ended December 31, 2011, 2010 and 2009, respectively. Minimum annual rental commitments for the years ending December 31, 2012 through 2016 are approximately $2.4 million, $2.4 million, $2.2 million, $1.4 million, and $0.2 million, respectively, and approximately $0.7 million in the aggregate thereafter.

Investments in Joint Ventures. We have entered into, and may continue in the future to enter into, joint ventures or partnerships (including limited liability companies) through which we own an indirect economic interest in less than 100% of the community or land owned directly by the joint venture or partnership. Our decision whether to hold the entire interest in an apartment community or land ourselves, or to have an indirect interest in the community or land through a joint venture or partnership, is based on a variety of factors and considerations, including: (i) our projection, in some circumstances, that we will achieve higher returns on our invested capital or reduce our risk if a joint venture or partnership vehicle is used; (ii) our desire to diversify our portfolio of communities by market; (iii) our desire at times to preserve our capital resources to maintain liquidity or balance sheet strength; and (iv) the economic and tax terms required by a seller of land or of a community, who may prefer or who may require less payment if the land or community is contributed to a joint venture or partnership. Investments in joint ventures or partnerships are not limited to a specified percentage of our assets. Each joint venture or partnership agreement is individually negotiated, and our ability to operate and/or dispose of a community in our sole discretion is limited to varying degrees in our existing joint venture agreements and may be limited to varying degrees depending on the terms of future joint venture agreements.

We have discretionary investment vehicles, the Funds, to make direct and indirect investments in multifamily real estate throughout the United States, primarily through acquisitions of operating properties and certain land parcels which will be acquired by or contributed to the Funds for development. As of December 31, 2011, we had capital contributions in one of the Funds of approximately $33.0 million; and it had a combined equity capital investment of $165.0 million. At December 31, 2011, this Fund was closed for future investments. The remaining Fund will serve, until the earlier of (i) April 8, 2012, or (ii) such time as 90% of the Fund's committed capital is invested, as the exclusive vehicle through which we will acquire fully-developed multifamily properties, subject to certain exceptions. These exceptions include properties acquired in tax-deferred transactions, follow-on investments made with respect to prior investments, significant transactions which include the issuance of our securities, significant individual asset and portfolio acquisitions, significant merger and acquisition activities, acquisitions which are inadvisable or inappropriate for the Funds, transactions with our existing ventures, contributions or sales of properties to entities in which we remain an investor, and transactions approved by the Fund's advisory board. The Funds will not restrict our development activities and will terminate on April 8, 2018. We are currently targeting acquisitions for the Fund where value creation opportunities are present through one or more of the following: redevelopment activities, market cycle opportunities, or improved property operations. One of our wholly-owned subsidiaries is the general partner of each of the Funds, and we have committed 20% of the total equity of the remaining open Fund, up to $37.5 million. We have received commitments to the remaining open Fund from an unaffiliated investor of $150 million and this Fund is closed to additional investors. At December 31, 2011, our capital contribution to the remaining Fund was approximately $23.7 million and it had a combined equity capital investment of $118.4 million.

Employment Agreements. At December 31, 2011, we had employment agreements with nine of our senior officers, the terms of which expire at various times through August 20, 2012. Such agreements provide for minimum salary levels, as well as various incentive compensation arrangements, which are payable based on the attainment of specific goals. The agreements also provide for severance payments plus a gross-up payment if certain situations occur, such as termination without cause or a change of control. In the case of six of the agreements, the severance payment equals one times the respective current annual base salary in the case of termination without cause and 2.99 times the respective average annual base salary over the previous three fiscal years in the case of a change of control and a termination of employment or a material adverse change in the scope of their duties. In the case of one agreement, the severance payment equals one times the respective current annual base salary for termination without cause and 2.99 times the greater of current gross income or average gross income over the previous three fiscal years in the case of a change of control. In the case of the other two agreements, the severance payment generally equals 2.99 times the respective average annual compensation over the previous three fiscal years in connection with, among other things, a termination without cause or a change of control, and the officer would be entitled to receive continuation and vesting of certain benefits in the case of such termination.

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Summary Of Significant Accounting Policies And Recent Accounting Pronouncements (Policies)

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Abstract]

Principles Of Consolidation

Principles of Consolidation. Our consolidated financial statements include our accounts and the accounts of other subsidiaries and joint ventures (including partnerships and limited liability companies) over which we have control. All intercompany transactions, balances, and profits have been eliminated in consolidation. Investments acquired or created are continuously evaluated based on the accounting guidance relating to variable interest entities ("VIEs"), which requires the consolidation of VIEs in which we are considered to be the primary beneficiary. If the investment is determined not to be a VIE, then the investment is evaluated for consolidation (primarily using a voting interest model) under the remaining consolidation guidance relating to real estate entities. If we are the general partner of a limited partnership, or manager of a limited liability company, we also consider the consolidation guidance relating to the rights of limited partners (non-managing members) to assess whether any rights held by the limited partners overcome the presumption of control by us.

Allocations Of Purchase Price

Allocations of Purchase Price. Upon the acquisition of real estate, we allocate the purchase price between tangible and intangible assets, which includes land, buildings, furniture and fixtures, the value of in-place leases, including above and below market leases, and acquired liabilities. When allocating the purchase price to acquired properties, we allocate costs to the estimated intangible value of in-place leases and above or below market leases and to the estimated fair value of furniture and fixtures, land, and buildings on a value determined by assuming the property was vacant by applying methods similar to those used by independent appraisers of income-producing property. Depreciation is computed on a straight-line basis over the remaining useful lives of the related tangible assets. The value of in-place leases and above or below market leases is amortized over the estimated average remaining life of leases in place at the time of acquisition. There was no unamortized value of in-place leases at December 31, 2011. The unamortized value of in-place leases at December 31, 2010 was approximately $3.9 million. Estimates of fair value of acquired debt are based upon interest rates available for the issuance of debt with similar terms and remaining maturities.

Asset Impairment

Asset Impairment. Long-lived assets are reviewed for impairment annually or whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Impairment exists if estimated future undiscounted cash flows associated with long-lived assets are not sufficient to recover the carrying value of such assets. We consider projected future discounted and undiscounted cash flows, trends, strategic decisions regarding future development plans, and other factors in our assessment of whether impairment conditions exist. When impairment exists, the long-lived asset is adjusted to its fair value. While we believe our estimates of future cash flows are reasonable, different assumptions regarding a number of factors, including market rents, economic conditions, and occupancies could significantly affect these estimates. In estimating fair value, management uses appraisals, management estimates, and discounted cash flow calculations which maximize inputs from a marketplace participant's perspective.

In addition, we evaluate our equity investments in joint ventures and if we believe there is an other than temporary decline in market value of our investment, we will record an impairment charge.

The value of our properties under development depends on market conditions, including estimates of the project start date as well as estimates of demand for multifamily communities. We have reviewed market trends and other marketplace information and have incorporated this information as well as our current outlook into the assumptions we use in our impairment analyses. Due to the judgment and assumptions applied in the impairment analyses, it is possible actual results could differ substantially from those estimated.

We believe the carrying value of our operating real estate assets, properties under development, and land is currently recoverable. However, if market conditions deteriorate or if changes in our development strategy significantly affect any key assumptions used in our fair value calculations, we may need to take material charges in future periods for impairments related to existing assets. Any such material non-cash charges could have an adverse effect on our consolidated financial position and results of operations.

Cash And Cash Equivalents

Cash and Cash Equivalents. All cash and investments in money market accounts and other highly liquid securities with a maturity of three months or less at the date of purchase are considered to be cash and cash equivalents. We maintain the majority of our cash and cash equivalents at major financial institutions in the United States and deposits with these financial institutions may exceed the amount of insurance provided on such deposits; however, we regularly monitor the financial stability of these financial institutions and believe we are not currently exposed to any significant default risk with respect to these deposits.

Cost Capitalization

Cost Capitalization. Real estate assets are carried at cost plus capitalized carrying charges. Carrying charges are primarily interest and real estate taxes which are capitalized as part of properties under development. Capitalized interest is generally based on the weighted average interest rate of our unsecured debt. Transaction costs associated with the acquisition of operating real estate assets are expensed. Expenditures directly related to the development and improvement of real estate assets are capitalized at cost as land and buildings and improvements. Indirect development costs, including salaries and benefits and other related costs directly attributable to the development of properties are also capitalized. All construction and carrying costs are capitalized and reported in the balance sheet as properties under development until the apartment homes are substantially completed. Upon substantial completion of the apartment homes, the total capitalized development cost for the apartment homes and the associated land is transferred to buildings and improvements and land, respectively.

As discussed above, carrying charges are principally interest and real estate taxes capitalized as part of properties under development. Capitalized interest was approximately $8.8 million, $5.7 million, and $10.3 million for the years ended December 31, 2011, 2010, and 2009, respectively. Capitalized real estate taxes were approximately $1.4 million, $0.8 million, and $1.9 million for the years ended December 31, 2011, 2010, and 2009, respectively.

Where possible, we stage our construction to allow leasing and occupancy during the construction period, which we believe minimizes the duration of the lease-up period following completion of construction. Our accounting policy related to properties in the development and leasing phase is to expense all operating expenses associated with completed apartment homes. We capitalize renovation and improvement costs we believe extend the economic lives of depreciable property. Capital expenditures subsequent to initial construction are capitalized and depreciated over their estimated useful lives.

Depreciation and amortization is computed over the expected useful lives of depreciable property on a straight-line basis with lives generally as follows:

		September 30,
	Estimated Useful  Life
Buildings and improvements		5-35 years
Furniture, fixtures, equipment and other		3-20 years
Intangible assets (in-place leases and above and below market leases)		underlying lease term

Derivative Financial Instruments

Derivative Financial Instruments. Derivative financial instruments are recorded in the consolidated balance sheets at fair value and we do not apply master netting for financial reporting purposes. Accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows or other types of forecasted transactions are cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes attributable to the earnings effect of the hedged transactions. We may enter into derivative contracts which are intended to economically hedge certain of our risks, for which hedge accounting does not apply or we elect not to apply hedge accounting.

Discontinued Operations

Discontinued Operations. A property is classified as a discontinued operation when (i) the operations and cash flows of the property can be clearly distinguished and have been or will be eliminated from our ongoing operations; (ii) the property has either been disposed of or is classified as held for sale; and (iii) we will not have any significant continuing involvement in the operations of the property after the disposal transactions. Significant judgments are involved in determining whether a property meets the criteria for discontinued operations reporting and the period in which these criteria are met. A property is classified as held for sale when (i) management commits to a plan to sell and it is actively marketed; (ii) it is available for immediate sale in its present condition and the sale is expected to be completed within one year; and (iii) it is unlikely significant changes to the plan will be made or the plan will be withdrawn.

The results of operations for properties sold during the period or classified as held for sale at the end of the current period are classified as discontinued operations in the current and prior periods. The property-specific components of earnings classified as discontinued operations include separately identifiable property-specific revenues, expenses, depreciation, and interest expense, if any. The gain or loss resulting from the eventual disposal of the held for sale properties is also classified within discontinued operations. Real estate assets held for sale are measured at the lower of carrying amount or fair value less costs to sell and are presented separately in the accompanying consolidated balance sheets. Subsequent to classification of a property as held for sale, no further depreciation is recorded. Properties sold by our unconsolidated entities are not included in discontinued operations and related gains or losses are reported as a component of equity in income (loss) of joint ventures.

Gains on sale of real estate are recognized using the full accrual or partial sale methods, as applicable, in accordance with accounting principles generally accepted in the United States of America ("GAAP"), provided various criteria relating to the terms of sale and any subsequent involvement with the real estate sold are met.

Fair Value

Fair Value. For financial assets and liabilities recorded at fair value on a recurring basis, fair value is the price we would receive to sell an asset, or pay to transfer a liability, in an orderly transaction with a market participant at the measurement date. In the absence of such data, fair value is estimated using internal information consistent with what market participants would use in a hypothetical transaction.

In determining fair value, observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions; preference is given to observable inputs. These two types of inputs create the following fair value hierarchy:

• Level 1: Quoted prices for identical instruments in active markets.

• Level 2: Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.

• Level 3: Significant inputs to the valuation model are unobservable.

The following describes the valuation methodologies we use to measure different financial instruments at fair value on a recurring basis:

 

Deferred Compensation Plan Investments. The estimated fair values of investment securities classified as deferred compensation plan investments are based on quoted market prices utilizing public information for the same transactions. Our deferred compensation plan investments are recorded in other assets in our consolidated balance sheets.

Derivative Financial Instruments. The estimated fair values of derivative financial instruments are valued using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and volatility. The fair values of interest rate swaps and caps are estimated using the market standard methodology of netting the discounted fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of interest rates (forward curves) derived from observable market interest rate curves. In addition, credit valuation adjustments, which consider the impact of any credit enhancements to the contracts, are incorporated in the fair values to account for potential nonperformance risk, including our own nonperformance risk and the respective counterparty's nonperformance risk. The fair value of interest rate caps is determined using the market standard methodology of discounting the future expected cash receipts which would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observed market interest rate curves and volatilities.

Although we have determined the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default. However, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined the credit valuation adjustments are not significant to the overall valuation of our derivatives. As a result, we have determined our derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

Income Recognition

Income Recognition. Our rental and other property revenue is recorded when due from residents and is recognized monthly as it is earned. Other property revenue consists primarily of utility rebillings and administrative, application, and other transactional fees charged to our residents. Our apartment homes are rented to residents on lease terms generally ranging from six to fifteen months, with monthly payments due in advance. All other sources of income, including interest and fee and asset management income, are recognized as earned. Eight of our properties are subject to rent control. Operations of multifamily properties acquired are recorded from the date of acquisition in accordance with the acquisition method of accounting. In management's opinion, due to the number of residents, the types and diversity of submarkets in which our properties operate, and the collection terms, there is no significant concentration of credit risk.

Insurance

Insurance. Our primary lines of insurance coverage are property, general liability, and health and workers' compensation. We believe our insurance coverage adequately insures our properties against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood, and other perils and adequately insures us against other risks. Losses are accrued based upon our estimates of the aggregate liability for claims incurred using certain actuarial assumptions followed in the insurance industry and based on our experience.

Other Assets, Net

Other Assets, Net. Other assets in our consolidated financial statements include investments under deferred compensation plans, deferred financing costs, non-real estate leasehold improvements and equipment, prepaid expenses, the value of in-place leases net of related accumulated amortization, available-for-sale investments, and other miscellaneous receivables. Investments under deferred compensation plans are classified as trading securities and are adjusted to fair market value at period end. See further discussion of our investments under deferred compensation plans in Note 11, "Share-based Compensation and Benefit Plans." Deferred financing costs are amortized no longer than the terms of the related debt on the straight-line method, which approximates the effective interest method. Corporate leasehold improvements and equipment are depreciated using the straight-line method over the shorter of the expected useful lives or the lease terms which range from three to ten years. Our available-for-sale investments are carried at fair value with unrealized gains and losses included in accumulated other comprehensive income (loss), a separate component of shareholders' equity.

Reportable Segments

Reportable Segments. Our multifamily communities are geographically diversified throughout the United States, and management evaluates operating performance on an individual property level. As each of our apartment communities has similar economic characteristics, residents, and products and services, our apartment communities have been aggregated into one reportable segment. Our multifamily communities generate rental revenue and other income through the leasing of apartment homes, which comprised approximately 98%, 97%, and 98% of our total property revenues and total non-property income, excluding income on deferred compensation plans for the years ended December 31, 2011, 2010, and 2009, respectively.

Restricted Cash

Restricted Cash. Restricted cash consists of escrow deposits held by lenders for property taxes, insurance and replacement reserves, cash required to be segregated for the repayment of residents' security deposits, and escrowed amounts related to our development and acquisition activities. Substantially all restricted cash is invested in demand and short-term instruments.

Share-based Compensation

Share-based Compensation. Compensation expense associated with share-based awards is recognized in our consolidated statements of income (loss) and comprehensive income using the grant-date fair values. Compensation cost for all share-based awards, including options, requires measurement at estimated fair value on the grant date and recognition of compensation expense over the requisite service period for awards expected to vest. The fair value of stock option grants is estimated using the Black-Scholes valuation model. Valuation models require the input of assumptions, including judgments to estimate the expected stock price volatility, expected life, and forfeiture rate. The compensation cost for share-based awards is based on the market value of the shares on the date of grant.

Use Of Estimates

Use of Estimates. In the application of GAAP, management is required to make estimates and assumptions which affect the reported amounts of assets and liabilities at the date of the financial statements, results of operations during the reporting periods, and related disclosures. Our more significant estimates include estimates supporting our impairment analysis related to the carrying values of our real estate assets, and estimates related to the valuation of our investments in joint ventures. These estimates are based on historical experience and other assumptions believed to be reasonable under the circumstances. Future events rarely develop exactly as forecasted, and the best estimates routinely require adjustment.

Recent Accounting Pronouncements. In May 2011, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2011-04 ("ASU 2011-04"), "Fair Value Measurement (Topic 820), Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS." ASU 2011-04 requires entities to separately disclose the amounts and reasons for any transfers of assets and liabilities into and out of Level 1 and Level 2 of the fair value hierarchy. For fair value measurements using significant unobservable inputs (Level 3), entities will be required to disclose quantitative information about the significant unobservable inputs used for all Level 3 measurements and a description of the valuation processes in determining fair value. In addition, ASU 2011-04 requires entities to provide a qualitative discussion about the sensitivity of recurring Level 3 measurements to changes in the unobservable inputs disclosed, including the interrelationship between inputs. Entities will also be required to disclose information about when the current use of a non-financial asset measured at fair value differs from its highest and best use and the hierarchy classification for items whose fair value is not recorded on the balance sheet but is disclosed in the notes. We do not anticipate changes to our existing classification and measurement of fair value when the amended standard becomes effective on January 1, 2012; however, we do expect our disclosures will be expanded as a result.

In June 2011, the FASB issued Accounting Standards Update 2011-05 ("ASU 2011-05"), "Presentation of Comprehensive Income." ASU 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of changes in stockholders' equity and requires all nonowner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. Additionally, ASU 2011-05 requires an entity to present reclassification adjustments on the face of the financial statements from other comprehensive income to net income. ASU 2011-05 is effective for us beginning January 1, 2012. We do not expect ASU 2011-05 to have a material effect on our financial statements as we currently present other comprehensive income components in a separate but consecutive statement.

In December 2011, the FASB issued Accounting Standards Update 2011-10 ("ASU 2011-10"), "Property Plant & Equipment (Topic 360): Derecognition of In-Substance Real Estate – a Scope Clarification." ASU 2011-10 resolves the diversity in practice about whether the guidance under FASB Accounting Standards Codification ("ASC") Subtopic 360-20, "Property, Plant, and Equipment – Real Estate Sales," applies to the derecognition of in substance real estate when a parent ceases to have a controlling financial interest in a subsidiary, as specified under ASC Subtopic 810-10, "Non-Controlling Interests in Consolidated Financial Statements – an amendment of ARB No. 51," that is in substance real estate as a result of default by the subsidiary on its nonrecourse debt. The new guidance is intended to emphasize the accounting for such transactions which is based upon substance over form. ASU 2011-10 is effective for us beginning July 1, 2012 and is not expected to have a material effect on our financial statements.

In December 2011, the FASB issued Accounting Standards Update 2011-12 ("ASU 2011-12"), "Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05." ASU 2011-12 indefinitely defers the requirements for entities to present reclassification adjustments out of accumulated other comprehensive income by component in both the statement in which net income is presented and the statement in which other comprehensive income is presented. Entities will still be required to comply with the other aspects of ASU 2011-05 as noted above. ASU 2011-12 is effective for us beginning January 1, 2012 and is not expected to have a material effect on our financial statements.

Description of New Accounting Pronouncements Not yet Adopted [Text Block]

Recent Accounting Pronouncements. In May 2011, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2011-04 ("ASU 2011-04"), "Fair Value Measurement (Topic 820), Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS." ASU 2011-04 requires entities to separately disclose the amounts and reasons for any transfers of assets and liabilities into and out of Level 1 and Level 2 of the fair value hierarchy. For fair value measurements using significant unobservable inputs (Level 3), entities will be required to disclose quantitative information about the significant unobservable inputs used for all Level 3 measurements and a description of the valuation processes in determining fair value. In addition, ASU 2011-04 requires entities to provide a qualitative discussion about the sensitivity of recurring Level 3 measurements to changes in the unobservable inputs disclosed, including the interrelationship between inputs. Entities will also be required to disclose information about when the current use of a non-financial asset measured at fair value differs from its highest and best use and the hierarchy classification for items whose fair value is not recorded on the balance sheet but is disclosed in the notes. We do not anticipate changes to our existing classification and measurement of fair value when the amended standard becomes effective on January 1, 2012; however, we do expect our disclosures will be expanded as a result.

In June 2011, the FASB issued Accounting Standards Update 2011-05 ("ASU 2011-05"), "Presentation of Comprehensive Income." ASU 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of changes in stockholders' equity and requires all nonowner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. Additionally, ASU 2011-05 requires an entity to present reclassification adjustments on the face of the financial statements from other comprehensive income to net income. ASU 2011-05 is effective for us beginning January 1, 2012. We do not expect ASU 2011-05 to have a material effect on our financial statements as we currently present other comprehensive income components in a separate but consecutive statement.

In December 2011, the FASB issued Accounting Standards Update 2011-10 ("ASU 2011-10"), "Property Plant & Equipment (Topic 360): Derecognition of In-Substance Real Estate – a Scope Clarification." ASU 2011-10 resolves the diversity in practice about whether the guidance under FASB Accounting Standards Codification ("ASC") Subtopic 360-20, "Property, Plant, and Equipment – Real Estate Sales," applies to the derecognition of in substance real estate when a parent ceases to have a controlling financial interest in a subsidiary, as specified under ASC Subtopic 810-10, "Non-Controlling Interests in Consolidated Financial Statements – an amendment of ARB No. 51," that is in substance real estate as a result of default by the subsidiary on its nonrecourse debt. The new guidance is intended to emphasize the accounting for such transactions which is based upon substance over form. ASU 2011-10 is effective for us beginning July 1, 2012 and is not expected to have a material effect on our financial statements.

In December 2011, the FASB issued Accounting Standards Update 2011-12 ("ASU 2011-12"), "Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in ASU 2011-05." ASU 2011-12 indefinitely defers the requirements for entities to present reclassification adjustments out of accumulated other comprehensive income by component in both the statement in which net income is presented and the statement in which other comprehensive income is presented. Entities will still be required to comply with the other aspects of ASU 2011-05 as noted above. ASU 2011-12 is effective for us beginning January 1, 2012 and is not expected to have a material effect on our financial statements.

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Income Taxes (Schedule Of Per Share Distributions Reported To Shareholders) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Ordinary income	$ 1.08	$ 0.89	$ 1.74
Long-term capital gain	$ 0.13	$ 0.20	$ 0.25
Unrecaptured Sec. 1250 gain	$ 0.23	$ 0.48	$ 0.06
Return of capital	$ 0.52	$ 0.23
Total	$ 1.96	$ 1.80	$ 2.05
Percentage of distributions representing tax preference items	2.83%	3.91%	3.94%

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Summary Of Significant Accounting Policies And Recent Accounting Pronouncements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Abstract]
Unamortized value of in-place leases		$ 3.9
Capitalized interest	8.8	5.7	10.3
Capitalized real estate taxes	$ 1.4	$ 0.8	$ 1.9
Percentage of rental revenue and other income from leasing of apartment homes	98.00%	97.00%	98.00%

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Consolidated Statements Of Equity And Perpetual Preferred Units (USD $)	Common Shares Of Beneficial Interest [Member]	Additional Paid-In Capital [Member]	Distributions In Excess Of Net Income [Member]	Notes Receivable Secured By Common Shares [Member]	Treasury Shares, At Cost [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]	Perpetual Preferred Units [Member]	Total
Perpetual preferred units, Beginning Balance at Dec. 31, 2008								$ 97,925,000
Beginning Balance at Dec. 31, 2008	660,000	2,237,703,000	(312,309,000)	(295,000)	(463,209,000)	(51,056,000)	89,862,000		1,501,356,000
Net income (loss)			(50,800,000)				(403,000)	7,000,000	(51,203,000)
Other comprehensive income						9,901,000			9,901,000
Common shares issued	104,000	272,008,000							272,112,000
Net share awards	2,000	10,157,000							10,159,000
Employee share purchase plan		105,000			1,027,000				1,132,000
Repayment of employee notes receivable, net				194,000					194,000
Common share options exercised		1,275,000							1,275,000
Conversions and redemptions of operating partnership units	2,000	3,759,000					(3,777,000)		(16,000)
Common shares repurchased					(6,000)				(6,000)
Purchase of noncontrolling interests		647,000					(748,000)		(101,000)
Cash distributions declared to perpetual preferred units								(7,000,000)
Cash distributions declared to equity holders			(129,462,000)				(6,332,000)		(135,794,000)
Other	2,000	2,000							4,000
Perpetual preferred units, Ending Balance at Dec. 31, 2009								97,925,000
Ending Balance at Dec. 31, 2009	770,000	2,525,656,000	(492,571,000)	(101,000)	(462,188,000)	(41,155,000)	78,602,000		1,609,013,000
Net income (loss)			23,216,000				926,000	7,000,000	24,142,000
Other comprehensive income						7,697,000			7,697,000
Common shares issued	49,000	231,602,000							231,651,000
Net share awards	4,000	11,609,000							11,613,000
Employee share purchase plan		232,000			933,000				1,165,000
Repayment of employee notes receivable, net				101,000					101,000
Common share options exercised		2,997,000							2,997,000
Conversions and redemptions of operating partnership units	3,000	3,525,000					(3,553,000)		(25,000)
Cash distributions declared to perpetual preferred units								(7,000,000)
Cash distributions declared to equity holders			(125,962,000)				(5,046,000)		(131,008,000)
Other	(2,000)	4,000					25,000		27,000
Perpetual preferred units, Ending Balance at Dec. 31, 2010								97,925,000	97,925,000
Ending Balance at Dec. 31, 2010	824,000	2,775,625,000	(595,317,000)		(461,255,000)	(33,458,000)	70,954,000		1,757,373,000
Net income (loss)			49,379,000				3,582,000	7,000,000	52,961,000
Other comprehensive income						32,775,000			32,775,000
Common shares issued	18,000	106,553,000							106,571,000
Net share awards	3,000	12,592,000			812,000				13,407,000
Employee share purchase plan		446,000			1,334,000				1,780,000
Common share options exercised		5,216,000			7,106,000				12,322,000
Conversions and redemptions of operating partnership units	1,000	591,000					(592,000)
Cash distributions declared to perpetual preferred units								(7,000,000)
Cash distributions declared to equity holders			(144,528,000)				(4,893,000)		(149,421,000)
Other	(1,000)	1,000
Perpetual preferred units, Ending Balance at Dec. 31, 2011								97,925,000	97,925,000
Ending Balance at Dec. 31, 2011	$ 845,000	$ 2,901,024,000	$ (690,466,000)		$ (452,003,000)	$ (683,000)	$ 69,051,000		$ 1,827,768,000

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Share Data

12 Months Ended

Dec. 31, 2011

Share Data [Abstract]

Share Data

3. Share Data

Basic earnings per share are computed using net income (loss) attributable to common shareholders and the weighted average number of common shares outstanding. Diluted earnings per share reflect common shares issuable from the assumed conversion of common share options and share awards granted and units convertible into common shares. Only those items having a dilutive impact on our basic earnings per share are included in diluted earnings per share. Our unvested share-based awards are considered participating securities and are reflected in the calculation of basic and diluted earnings per share using the two-class method. The number of common share equivalent securities excluded from the diluted earnings per share calculation was approximately 3.8 million, 4.8 million, and 4.9 million for the years ended December 31, 2011, 2010, and 2009, respectively. These securities, which include common share options and share awards granted and units convertible into common shares, were excluded from the diluted earnings per share calculation as they are anti-dilutive.

The following table presents information necessary to calculate basic and diluted earnings per share for the periods indicated:

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands, except per share amounts)	2011			2010			2009
Earnings per share calculation – basic
Income (loss) from continuing operations attributable to common shareholders	$	22,546		$	8,242		$	(75,201	)
Amount allocated to participating securities		(551	)		(265	)		637
Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities		21,995			7,977			(74,564	)
Income from discontinued operations, including gain on sale, attributable to common shareholders		26,833			14,974			24,401
Net income (loss) attributable to common shareholders, as adjusted	$	48,828		$	22,951		$	(50,163	)
Income (loss) from continuing operations attributable to common shareholders,as adjusted – per share	$	0.30		$	0.11		$	(1.19	)
Income from discontinued operations, including gain on sale, attributable to common shareholders – per share		0.37			0.22			0.39
Net income (loss) attributable to common shareholders, as adjusted – per share	$	0.67		$	0.33		$	(0.80	)
Weighted average number of common shares outstanding – basic		72,756			68,608			62,359
Earnings per share calculation – diluted
Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities	$	21,995		$	7,977		$	(74,564	)
Income allocated to common units		45			—			—
Income (loss) from continuing operations attributable to common shareholders, as adjusted		22,040			7,977			(74,564	)
Income from discontinued operations, including gain on sale, attributable to common shareholders		26,833			14,974			24,401
Net income (loss) attributable to common shareholders, as adjusted	$	48,873		$	22,951		$	(50,163	)
Income (loss) from continuing operations attributable to common shareholders, as adjusted – per share	$	0.30		$	0.11		$	(1.19	)
Income from discontinued operations, including gain on sale, attributable to common shareholders – per share		0.36			0.22			0.39
Net income (loss) attributable to common shareholders, as adjusted – per share	$	0.66		$	0.33		$	(0.80	)
Weighted average number of common shares outstanding – basic		72,756			68,608			62,359
Incremental shares issuable from assumed conversion of:
Common share options and share awards granted		706			349			—
Common units		239			—			—
Weighted average number of common shares outstanding – diluted		73,701			68,957			62,359

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Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Aug. 31, 2011 Designated Hedges [Member]
Derivative [Line Items]
Interest rate swap, notional amount				$ 16,600,000
Discontinuation of cash flow hedge	In connection with the repayment of the $500 million term loan on June 6, 2011, we discontinued the hedging relationship on a $500 million interest rate swap used
Repayment of term loan	500,000,000
Recognized non-cash charge related to the discontinuation of the cash flow hedge for the term loan	29,791,000
Interest rate swaps maturity date	October 2012
Ineffective portion of the change in fair value of the derivatives	0	0	0
Fair value of derivatives in a net liability position	18,200,000
Aggregate termination value to settle obligations	$ 18,200,000

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Net Change In Operating Accounts (Effect Of Changes In The Operating Accounts On Cash Flows From Operating Activities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Change In Operating Accounts [Abstract]
Other assets, net	$ 5,183	$ (895)	$ 10,808
Accounts payable and accrued expenses	2,026	2,209	(10,511)
Accrued real estate taxes	(122)	(1,269)	(64)
Other liabilities	(17,152)	4,188	(172)
Other	596	275	191
Change in operating accounts	$ (9,469)	$ 4,508	$ 252

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Summary Of Significant Accounting Policies And Recent Accounting Pronouncements (Tables)

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Abstract]

Expected Useful Lives Of Depreciable Property

		September 30,
	Estimated Useful  Life
Buildings and improvements		5-35 years
Furniture, fixtures, equipment and other		3-20 years
Intangible assets (in-place leases and above and below market leases)		underlying lease term

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Postretirement Benefits (Postretirement Benefits Change In Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Postretirement Benefits [Abstract]
Employer contributions	$ 220	$ 214
Benefits paid	$ (220)	$ (214)

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Noncontrolling Interests (Tables)

12 Months Ended

Dec. 31, 2011

Noncontrolling Interests [Abstract]

Effect Of Changes In Ownership Interest In Subsidiaries

		September 30,		September 30,		September 30,
	2011		2010		2009
Net income (loss) attributable to common shareholders	$	49,379	$	23,216	$	(50,800	)
Transfers from the noncontrolling interests:
Increase in equity for conversion of operating partnership units		592		3,528		3,761
Increase in equity from purchase of noncontrolling interests		—		—		647
Change in common equity and net transfers from noncontrolling interests	$	49,971	$	26,744	$	(46,392	)

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Net Change In Operating Accounts

12 Months Ended

Dec. 31, 2011

Net Change In Operating Accounts [Abstract]

Net Change In Operating Accounts

13. Net Change in Operating Accounts

The effect of changes in the operating accounts on cash flows from operating activities is as follows:

		September 30,			September 30,			September 30,
	Year Ended December 31,
(in thousands)	2011			2010			2009
Change in assets:
Other assets, net	$	5,183		$	(895	)	$	10,808
Change in liabilities:
Accounts payable and accrued expenses		2,026			2,209			(10,511	)
Accrued real estate taxes		(122	)		(1,269	)		(64	)
Other liabilities		(17,152	)		4,188			(172	)
Other		596			275			191
Change in operating accounts	$	(9,469	)	$	4,508		$	252