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DEBT OBLIGATIONS - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 13, 2018 | Dec. 12, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Consolidated debt obligations |  |  |  |
Plus: premiums/(discounts), net |  |  | $ 10,707 |
Net deferred financing costs |  |  | (10,336) |
Total Debt Obligations |  |  | 2,144,418 | $ 2,028,046
Secured Debt |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | 315,437 | 323,032
Plus: premiums/(discounts), net |  |  | (1,383) | (1,759)
Net deferred financing costs |  |  | (242) | (404)
Total mortgage indebtedness |  |  | 313,812 | 320,869
Secured Debt | Two Logan Square |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 81,103 | 82,805
Effective interest rate |  |  | 3.98% |
Secured Debt | Four Tower Bridge |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 9,291 | 9,526
Effective interest rate |  |  | 4.50% |
Secured Debt | One Commerce Square |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 116,571 | 120,183
Effective interest rate |  |  | 3.64% |
Secured Debt | Two Commerce Square |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 108,472 | 110,518
Effective interest rate |  |  | 4.51% |
Unsecured Debt |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 1,828,610 | 1,721,110
Plus: premiums/(discounts), net |  |  | 12,090 | (4,096)
Net deferred financing costs |  |  | (10,094) | (9,837)
Total unsecured indebtedness |  |  | 1,830,606 | 1,707,177
Unsecured Debt | $600 million Unsecured Credit Facility |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | 0 | 92,500
Unsecured Debt | Seven-Year Term Loan - Swapped to fixed |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross | $ 250,000 |  | $ 250,000 | 250,000
Effective interest rate | 2.87% |  | 2.87% |
Unsecured Debt | $350.0M 3.95% Guaranteed Notes due 2023 |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 350,000 | 350,000
Effective interest rate |  |  | 3.87% |
Unsecured Debt | $350.0M 4.10% Guaranteed Notes due 2024 |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 350,000 | 250,000
Effective interest rate |  |  | 3.78% |
Unsecured Debt | $450.0M 3.95% Guaranteed Notes due 2027 |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 450,000 | 450,000
Effective interest rate |  |  | 4.03% |
Unsecured Debt | $350.0M 4.55% Guaranteed Notes due 2029 |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 350,000 | 250,000
Effective interest rate |  |  | 4.30% |
Unsecured Debt | Indenture IA (Preferred Trust I) |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 27,062 | 27,062
Unsecured Debt | Indenture IB (Preferred Trust I) - Swapped to fixed |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 25,774 | 25,774
Effective interest rate |  |  | 3.30% |
Unsecured Debt | Indenture II (Preferred Trust II) |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term debt, gross |  |  | $ 25,774 | $ 25,774
LIBOR | Unsecured Debt | $600 million Unsecured Credit Facility |  |  |  |
Consolidated debt obligations |  |  |  |
Variable interest rate |  |  | 1.10% |
LIBOR | Unsecured Debt | Seven-Year Term Loan - Swapped to fixed |  |  |  |
Consolidated debt obligations |  |  |  |
Variable interest rate | 1.25% | 1.80% |  |
LIBOR | Unsecured Debt | Indenture IA (Preferred Trust I) |  |  |  |
Consolidated debt obligations |  |  |  |
Variable interest rate |  |  | 1.25% |
LIBOR | Unsecured Debt | Indenture II (Preferred Trust II) |  |  |  |
Consolidated debt obligations |  |  |  |
Variable interest rate |  |  | 1.25% |

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