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Unsecured Revolving Credit Facility (Details 3)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
building
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]    
Number of Real Estate Properties | building 10  
Unsecured debt $ 2,181,382 $ 1,783,121
Terms of the Credit Facility    
Unsecured line of credit 0 140,000
Kilroy Realty, L.P. [Member]    
Debt Instrument [Line Items]    
Unsecured debt 2,181,382 1,783,121
Terms of the Credit Facility    
Unsecured line of credit 0 140,000
Kilroy Realty, L.P. [Member] | Revolving Credit Facility [Member]    
Terms of the Credit Facility    
Unsecured line of credit 0 140,000
Remaining borrowing capacity 600,000 460,000
Total borrowing capacity [1] $ 600,000 $ 600,000
Line of Credit Facility, Interest Rate at Period End [2] 0.00% 1.41%
Line of Credit Facility, Commitment Fee Percentage [3] 0.20% 0.25%
Line of Credit Facility, Expiration Date Jul. 01, 2019  
Debt Instrument, Contingent Additional Borrowings $ 311,000  
Debt Instrument, Basis Spread on Variable Rate 1.05% 1.25%
Debt Issuance Cost $ 4,900  
Term Loan Facility [Member] | Kilroy Realty, L.P. [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 150,000 $ 150,000
Terms of the Credit Facility    
Debt Instrument, Basis Spread on Variable Rate [4] 1.35% 1.56%
Maturity Date Jul. 01, 2019  
Term Loan Facility [Member] | Kilroy Realty, L.P. [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 39,000  
London Interbank Offered Rate (LIBOR) [Member] | Term Loan Facility [Member] | Kilroy Realty, L.P. [Member] | Line of Credit [Member]    
Terms of the Credit Facility    
Debt Instrument, Basis Spread on Variable Rate 1.15% 1.40%
[1] We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $311.0 million under an accordion feature under the terms of the unsecured revolving credit facility and term loan facility.
[2] Our unsecured revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.050% and LIBOR plus 1.250% as of September 30, 2015 and December 31, 2014, respectively.
[3] Our facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs. As of September 30, 2015, $4.9 million of deferred financing costs remains to be amortized through the maturity date of our unsecured revolving credit facility.
[4] Our unsecured term loan facility interest rate was calculated based on an annual rate of LIBOR plus 1.150% and LIBOR plus 1.400% as of September 30, 2015 and December 31, 2014, respectively.