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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Excess stock, par value $ 0.01 $ 0.01
Excess stock, shares authorized 150,000,000 150,000,000
Excess stock, shares issued 0 0
Excess stock, shares outstanding 0 0
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 50,000,000 50,000,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 154,519,139 154,404,186
Common stock, shares outstanding 154,440,239 154,325,286
Treasury common stock at cost, shares 78,900 78,900
General Partners' Capital Account, Units Outstanding 1,722,375  
Limited Partners' Capital Account, Units Outstanding 152,717,864  
Real Estate Investment Property, at Cost $ 21,687,639 $ 21,096,642
Accumulated depreciation (4,838,496) (4,589,634)
Cash and Cash Equivalents 322,502 434,767
Cash held in escrow 101,282 70,602
Tenant and other receivables 98,502 92,186
Accrued rental income 926,274 861,575
Deferred Charges, net 669,545 679,038
Prepaid expense and other assets 133,443 77,971
Mortgage notes payable, net 2,967,548 2,979,281
Accounts payable and accrued expenses 315,462 331,500
Accrued interest payable 92,809 83,646
Other Liabilities $ 468,433 $ 443,980
Series B Cumulative Redeemable Preferred Stock [Member]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 92,000 92,000
Series B Dividend Rate Percentage 5.25% 5.25%
Series B, Liquidation Preference Per Share (dollars per share) $ 2,500.00 $ 2,500
Series B, shares issued 80,000 80,000
Series B, Shares Outstanding (in shares) 80,000 80,000
Boston Properties Limited Partnership    
NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding 16,804,929 16,810,378
NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding 992,321 818,343
General Partners' Capital Account, Units Outstanding 1,722,375 1,719,540
Limited Partners' Capital Account, Units Outstanding 152,717,864 152,605,746
Real Estate Investment Property, at Cost $ 21,281,726 $ 20,685,164
Accumulated depreciation (4,741,280) (4,496,959)
Cash and Cash Equivalents 322,502 434,767
Cash held in escrow 101,282 70,602
Tenant and other receivables 98,502 92,186
Accrued rental income 926,274 861,575
Deferred Charges, net 669,545 679,038
Prepaid expense and other assets 133,443 77,971
Mortgage notes payable, net 2,967,548 2,979,281
Accounts payable and accrued expenses 315,462 331,500
Accrued interest payable 92,809 83,646
Other Liabilities $ 468,433 $ 443,980
Boston Properties Limited Partnership | Series B Cumulative Redeemable Preferred Stock [Member]    
Series B Dividend Rate Percentage 5.25% 5.25%
Series B, Liquidation Preference Per Share (dollars per share) $ 2,500 $ 2,500
Series B, shares issued 80,000 80,000
Series B, Shares Outstanding (in shares) 80,000 80,000
VIE    
Real Estate Investment Property, at Cost $ 7,426,998 $ 7,172,718
Accumulated depreciation (942,678) (854,172)
Cash and Cash Equivalents 284,053 304,955
Cash held in escrow 6,118 6,135
Tenant and other receivables 42,193 27,057
Accrued rental income 269,794 242,589
Deferred Charges, net 261,951 281,678
Prepaid expense and other assets 62,325 33,666
Mortgage notes payable, net 2,931,852 2,939,183
Accounts payable and accrued expenses 78,893 106,683
Accrued interest payable 6,659 6,907
Other Liabilities 200,306 164,806
VIE | Boston Properties Limited Partnership    
Real Estate Investment Property, at Cost 7,426,998 7,172,718
Accumulated depreciation (942,678) (854,172)
Cash and Cash Equivalents 284,053 304,955
Cash held in escrow 6,118 6,135
Tenant and other receivables 42,193 27,057
Accrued rental income 269,794 242,589
Deferred Charges, net 261,951 281,678
Prepaid expense and other assets 62,325 33,666
Mortgage notes payable, net 2,931,852 2,939,183
Accounts payable and accrued expenses 78,893 106,683
Accrued interest payable 6,659 6,907
Other Liabilities $ 200,306 $ 164,806