Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies We have not made any changes to our significant accounting policies disclosed in our 2021 Annual Report on Form 10-K. Use of Estimates The preparation of consolidated financial statements in conformity with US GAAP requires management to make certain estimates that affect the reported amounts in the consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. Revenue Recognition Rental revenues and tenant recoveries We account for our rental revenues and tenant recoveries in accordance with Topic 842 "Leases". Rental revenues and tenant recoveries are included in: (i) Rental revenues and tenant recoveries under Office rental, and (ii) Rental revenues under Multifamily rental, in our consolidated statements of operations. Collectibility In accordance with Topic 842, we perform an assessment as to whether or not substantially all of the amounts due under a tenant’s lease agreement is deemed probable of collection. This assessment involves using a methodology that requires judgment and estimates about matters that are uncertain at the time the estimates are made, including tenant specific factors, specific industry conditions, and general economic trends and conditions. For leases where we have concluded it is probable that we will collect substantially all the lease payments due under those leases, we continue to record lease income on a straight-line basis over the lease term. For leases where we have concluded that it is not probable that we will collect substantially all the lease payments due under those leases, we limit the lease income to the lesser of the income recognized on a straight-line basis or cash basis. If our conclusion of collectibility changes, we will record the difference between the lease income that would have been recognized on a straight-line basis and cash basis as a current-period adjustment to rental revenues and tenant recoveries. We write-off tenant receivables and deferred rent receivables as a charge against rental revenues and tenant recoveries in the period we conclude that substantially all of the lease payments are not probable of collection. If we subsequently collect amounts that were previously written off then the amounts collected are recorded as an increase to our rental revenues and tenant recoveries. Charges for uncollectible tenant receivables and deferred rent receivables, which were primarily due to the impact of the COVID-19 pandemic, reduced our office revenues by: •$0.1 million and $0.8 million for the three months ended June 30, 2022 and 2021, respectively, and •$0.2 million and $2.5 million for the six months ended June 30, 2022 and 2021, respectively. We restored accrual basis accounting for certain tenants that were previously determined to be uncollectible and accounted for on a cash basis of accounting, which increased our office revenues by $1.7 million for the three months ended June 30, 2022. Office parking revenues We account for our office parking revenues in accordance with ASC 606 "Revenue from Contracts with Customers". Office parking revenues are included in Parking and other income under Office rental in our consolidated statements of operations. Our lease contracts generally make a specified number of parking spaces available to the tenant, and we bill and recognize parking revenues on a monthly basis in accordance with the lease agreements, generally using the monthly parking rates in effect at the time of billing. Office parking revenues were: •$21.5 million and $16.2 million for the three months ended June 30, 2022 and 2021, respectively, and •$40.5 million and $31.1 million for the six months ended June 30, 2022 and 2021, respectively. Office parking receivables, which are included in Tenant receivables in our consolidated balance sheets, were: •$1.0 million as of June 30, 2022, and •$0.8 million as of December 31, 2021. Income Taxes We have elected to be taxed as a REIT under the Code. Provided that we qualify for taxation as a REIT, we are generally not subject to corporate-level income tax on the earnings distributed currently to our stockholders that we derive from our REIT qualifying activities. We are subject to corporate-level tax on the earnings that we derive through our TRS. New Accounting Pronouncements Changes to US GAAP are implemented by the FASB in the form of ASUs. We consider the applicability and impact of all ASUs. As of the date of this Report, the FASB has not issued any ASUs that we expect to be applicable and have a material impact on our consolidated financial statements.