Income Taxes	3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	10. INCOME TAXES We elected to be taxed as a REIT, effective January 1, 2003, under the Internal Revenue Code for U.S. federal income tax purposes. We generally must distribute annually at least 90% of our net taxable income, subject to certain adjustments and excluding any net capital gain, in order for U.S. federal income tax not to apply to our earnings that we distribute. To the extent that we satisfy this distribution requirement, but distribute less than 100% of our net taxable income, we will be subject to U.S. federal income tax on our undistributed taxable income. In addition, we will be subject to a 4% nondeductible excise tax if the actual amount that we pay out to our stockholders in a calendar year is less than a minimum amount specified under U.S. federal tax laws. Our qualification as a REIT also depends on our ability to meet various other requirements imposed by the Internal Revenue Code, which relate to organizational structure, diversity of stock ownership, and certain restrictions with regard to the nature of our assets and the sources of our income. Even if we qualify as a REIT, we may be subject to certain U.S. federal income and excise taxes and state and local taxes on our income and assets. If we fail to maintain our qualification as a REIT for any taxable year, we may be subject to material penalties as well as federal, state, and local income tax on our taxable income at regular corporate rates and we would not be able to qualify as a REIT for the subsequent four full taxable years. As of March 31, 2015 and December 31, 2014, we were in compliance with all REIT requirements. During the three months ended March 31, 2015 and 2014, we recorded a current income tax provision of $245,000 and $531,000, respectively, related to our taxable REIT subsidiaries as well as various state and local taxes. We did not have any deferred tax assets or liabilities as of March 31, 2015 or December 31, 2014. As a result of our issuance of 25,875,000 shares of class A common stock in May 2013, the availability of our net operating losses, or NOLs, and net capital losses, or NCLs, is generally limited to $2.0 million per annum by change of control provisions promulgated by the Internal Revenue Service, or the IRS, with respect to the ownership of Blackstone Mortgage Trust. As of December 31, 2014, we had NOLs of $159.0 million and NCLs of $32.0 million available to be carried forward and utilized in current or future periods. If we are unable to utilize our NOLs, they will expire in 2029. If we are unable to utilize our NCLs, $31.4 million will expire in 2015, and $602,000 will expire in 2016 or later. As of March 31, 2015, tax years 2010 through 2014 remain subject to examination by taxing authorities.

10. INCOME TAXES

We elected to be taxed as a REIT, effective January 1, 2003, under the Internal Revenue Code for U.S. federal income tax purposes. We generally must distribute annually at least 90% of our net taxable income, subject to certain adjustments and excluding any net capital gain, in order for U.S. federal income tax not to apply to our earnings that we distribute. To the extent that we satisfy this distribution requirement, but distribute less than 100% of our net taxable income, we will be subject to U.S. federal income tax on our undistributed taxable income. In addition, we will be subject to a 4% nondeductible excise tax if the actual amount that we pay out to our stockholders in a calendar year is less than a minimum amount specified under U.S. federal tax laws.

Our qualification as a REIT also depends on our ability to meet various other requirements imposed by the Internal Revenue Code, which relate to organizational structure, diversity of stock ownership, and certain restrictions with regard to the nature of our assets and the sources of our income. Even if we qualify as a REIT, we may be subject to certain U.S. federal income and excise taxes and state and local taxes on our income and assets. If we fail to maintain our qualification as a REIT for any taxable year, we may be subject to material penalties as well as federal, state, and local income tax on our taxable income at regular corporate rates and we would not be able to qualify as a REIT for the subsequent four full taxable years. As of March 31, 2015 and December 31, 2014, we were in compliance with all REIT requirements.

During the three months ended March 31, 2015 and 2014, we recorded a current income tax provision of $245,000 and $531,000, respectively, related to our taxable REIT subsidiaries as well as various state and local taxes. We did not have any deferred tax assets or liabilities as of March 31, 2015 or December 31, 2014.

As a result of our issuance of 25,875,000 shares of class A common stock in May 2013, the availability of our net operating losses, or NOLs, and net capital losses, or NCLs, is generally limited to $2.0 million per annum by change of control provisions promulgated by the Internal Revenue Service, or the IRS, with respect to the ownership of Blackstone Mortgage Trust. As of December 31, 2014, we had NOLs of $159.0 million and NCLs of $32.0 million available to be carried forward and utilized in current or future periods. If we are unable to utilize our NOLs, they will expire in 2029. If we are unable to utilize our NCLs, $31.4 million will expire in 2015, and $602,000 will expire in 2016 or later.

As of March 31, 2015, tax years 2010 through 2014 remain subject to examination by taxing authorities.