**Exhibit      21.1**

| **Subsidiary**                                     |   | **State                of Incorporation****or                Organization** |
|----------------------------------------------------|--------|-----------------------------------------------------------------------------|
|                                               |   |                                                                        |
| 1                COMMERCE REALTY L.L.C.            |   | NJ                                                                          |
| 1                EXECUTIVE REALTY L.L.C.           |   | NJ                                                                          |
| 2                COMMERCE REALTY L.L.C.            |   | NJ                                                                          |
| 2                EXECUTIVE REALTY L.L.C.           |   | NJ                                                                          |
| 2                PARAGON REALTY L.L.C.             |   | DE                                                                          |
| 2                TWOSOME REALTY L.L.C.             |   | NJ                                                                          |
| 3                CAMPUS REALTY LLC                 |   | DE                                                                          |
| 3                ODELL REALTY L.L.C.               |   | NY                                                                          |
| 3                PARAGON REALTY L.L.C.             |   | DE                                                                          |
| 4                GATEHALL REALTY L.L.C.            |   | NJ                                                                          |
| 4                SENTRY HOLDING L.L.C.             |   | DE                                                                          |
| 4                SENTRY REALTY L.L.C.              |   | DE                                                                          |
| 5                WOOD HOLLOW REALTY, L.L.C.        |   | NJ                                                                          |
| 5/6                SKYLINE REALTY L.L.C.           |   | NY                                                                          |
| 6                PARSIPPANY L.L.C.                 |   | NJ                                                                          |
| 9                CAMPUS REALTY L.L.C.              |   | NJ                                                                          |
| 11                COMMERCE DRIVE ASSOCIATES L.L.C. |   | NJ                                                                          |
| 12                SKYLINE ASSOCIATES L.L.C.        |   | NY                                                                          |
| 14/16                SKYLINE REALTY L.L.C.         |   | NY                                                                          |
| 14                COMMERCE REALTY L.L.C.           |   | NJ                                                                          |
| 20                COMMERCE DRIVE ASSOCIATES L.L.C. |   | NJ                                                                          |
| 25                COMMERCE REALTY, L.L.C.          |   | NJ                                                                          |
| 30                TWOSOME REALTY L.L.C.            |   | NJ                                                                          |
| 31                TWOSOME REALTY L.L.C.            |   | NJ                                                                          |
| 35                WATERVIEW HOLDING L.L.C.         |   | DE                                                                          |
| 35                WATERVIEW SPE LLC                |   | DE                                                                          |
| 40                TWOSOME REALTY L.L.C.            |   | NJ                                                                          |
| 41                TWOSOME REALTY L.L.C.            |   | NJ                                                                          |
| 50                TWOSOME REALTY L.L.C.            |   | NJ                                                                          |

----

| 78/PINSON                PARTNERS L.L.C.                                  |   | NJ |
|---------------------------------------------------------------------------|--------|----|
| 97                FORSTER REALTY L.L.C.                                   |   | NJ |
| 100                WILLOWBROOK REALTY L.L.C.                              |   | DE |
| 101                COMMERCE REALTY L.L.C.                                 |   | NJ |
| 101                EXECUTIVE REALTY L.L.C.                                |   | NJ |
| 102                EXECUTIVE REALTY L.L.C.                                |   | NJ |
| 105                CHALLENGER HOLDING L.L.C.                              |   | DE |
| 105                CHALLENGER OWNER LLC                                   |   | NJ |
| 120                PASSAIC STREET L.L.C.                                  |   | NJ |
| 201                COMMERCE REALTY L.L.C.                                 |   | NJ |
| 201                WILLOWBROOK FUNDING L.L.C.                             |   | NJ |
| 225                CORPORATE REALTY L.L.C.                                |   | NY |
| 225                EXECUTIVE REALTY L.L.C.                                |   | NJ |
| 232                STRAWBRIDGE REALTY L.L.C.                              |   | NJ |
| 300                HORIZON REALTY L.L.C.                                  |   | NJ |
| 300                TICE REALTY ASSOCIATES L.L.C.                          |   | NJ |
| 343                THORNALL HOLDING L.L.C.                                |   | DE |
| 343                THORNALL SPE LLC                                       |   | DE |
| 395                W. PASSAIC L.L.C.                                      |   | NJ |
| 400                CHESTNUT REALTY L.L.C.                                 |   | NJ |
| 400                RELLA REALTY ASSOCIATES L.L.C.                         |   | NY |
| 461                FROM REALTY L.L.C.                                     |   | NJ |
| 470                CHESTNUT REALTY L.L.C.                                 |   | NJ |
| 500                COLUMBIA TURNPIKE ASSOCIATES L.L.C.                    |   | NJ |
| 500                WEST PUTNAM L.L.C.                                     |   | CT |
| 530                CHESTNUT REALTY L.L.C.                                 |   | NJ |
| 600                HORIZON CENTER L.L.C.                                  |   | NJ |
| 600                PARSIPPANY ASSOCIATES L.L.C.                           |   | NJ |
| 795                FOLSOM REALTY ASSOCIATES L.P.                          |   | CA |
| 800                MAIN STREET, L.L.C.                                    |   | DE |
| 1000                BRIDGEPORT REALTY L.L.C.                              |   | CT |
| 1256                N. CHURCH REALTY L.L.C.                               |   | NJ |
| 1266                SOUNDVIEW REALTY L.L.C.                               |   | CT |
| 1507                LANCER REALTY L.L.C.                                  |   | NJ |
| 1717                REALTY ASSOCIATES L.L.C.                              |   | NJ |
| A-B                OFFICE MEADOWLANDS MACK-CALI LIMITED PARTNERSHIP       |   | DE |
| AIRPORT                PROPERTIES ASSOCIATES L.L.C.                       |   | NJ |
| BELMAR                REALTY PARTNERS, LLC                                |   | DE |
| BMP                MOORESTOWN REALTY L.L.C.                               |   | NJ |
| BMP                SOUTH REALTY L.L.C.                                    |   | NJ |
| BRIDGE                PLAZA REALTY ASSOCIATES L.L.C.                      |   | NJ |
| C.W.                ASSOCIATES L.L.C.                                     |   | NJ |
| C-D                OFFICE MEADOWLANDS MACK-CALI LIMITED PARTNERSHIP       |   | DE |
| CAL-HARBOR                II & III URBAN RENEWAL ASSOCIATES L.P. |   | NJ |
| CAL-HARBOR                IV URBAN RENEWAL ASSOCIATES L.P.                |   | NJ |

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| CAL-HARBOR                V LEASING ASSOCIATES L.L.C.            |   | NJ |
|------------------------------------------------------------------|--------|----|
| CAL-HARBOR                V URBAN RENEWAL ASSOCIATES L.P.        |   | NJ |
| CAL-HARBOR                VI URBAN RENEWAL ASSOCIATES L.P.       |   | NJ |
| CAL-HARBOR                VII LEASING ASSOCIATES L.L.C.          |   | NJ |
| CAL-HARBOR                VII URBAN RENEWAL ASSOCIATES L.P.      |   | NJ |
| CAL-HARBOR                SO. PIER URBAN RENEWAL ASSOCIATES L.P. |   | NJ |
| CALI                HARBORSIDE (FEE) ASSOCIATES L.P.             |   | NJ |
| CAMPUS                CONSERVATION AND MANAGEMENT, INC.          |   | NJ |
| CENTURY                PLAZA ASSOCIATES L.L.C.                   |   | NJ |
| CLEARBROOK                ROAD ASSOCIATES L.L.C.                 |   | NY |
| COLLEGE                ROAD REALTY L.L.C.                        |   | NJ |
| COMMERCENTER                REALTY ASSOCIATES L.L.C.             |   | NJ |
|  CROSS                WESTCHESTER REALTY ASSOCIATES L.L.C.  |   | NY |
| CWLT                ROSELAND EXCHANGE L.L.C.                     |   | NJ |
| D.B.C.                REALTY L.L.C.                              |   | NJ |
| ELEVENTH                SPRINGHILL LAKE ASSOCIATES, LLC          |   | MD |
| ELMSFORD                REALTY ASSOCIATES L.L.C.                 |   | NY |
| FIVE                SENTRY REALTY ASSOCIATES L.P.                |   | PA |
| FOURTEENTH                SPRINGHILL LAKE ASSOCIATES L.L.C.      |   | DE |
| GMW                VILLAGE ASSOCIATES, L.L.C.                    |   | DE |
| GALE                CONSTRUCTION COMPANY, INC.                   |   | PA |
| GALE                MICHIGAN MANAGEMENT LLC                      |   | DE |
| HARBORSIDE                HOSPITALITY CORP.                      |   | NJ |
| HORIZON                CENTER REALTY ASSOCIATES L.L.C.           |   | NJ |
| JUMPING                BROOK REALTY ASSOCIATES L.L.C.            |   | NJ |
| KEMBLE                PLAZA II REALTY L.L.C.                     |   | NJ |
| KNIGHTSBRIDGE                REALTY L.L.C.                       |   | NJ |
| LINWOOD                REALTY L.L.C.                             |   | NJ |
| LITTLETON                REALTY ASSOCIATES L.L.C.                |   | NJ |
| M-C                3 CAMPUS, LLC                                 |   | DE |
| M-C                500 MAIN STREET, LLC                          |   | DE |
| M-C                800 MAIN STREET, LLC                          |   | DE |
| M-C                BELMAR, LLC                                   |   | DE |
| M-C                CALIFORNIA SERVICES, INC.                     |   | DE |
| M-C                CAPITOL ASSOCIATES L.L.C.                     |   | DE |
| M-C                CHURCH REALTY L.L.C.                          |   | NJ |
| M-C                HARBORSIDE PROMENADE LLC                      |   | NJ |
| M-C                HARSIMUS PARTNERS L.L.C.                      |   | NJ |
| M-C                HUDSON LLC                                    |   | NJ |
| M-C                HUDSON STREET LLC                             |   | NJ |
| M-C                KIMBALL, LLC                                  |   | DE |
| M-C                LENOLA REALTY L.L.C.                          |   | NJ |
| M-C                METROPOLITAN REALTY L.L.C.                    |   | NJ |
| M-C                MICHIGAN INC.                                 |   | DE |
| M-C                NEWARK L.L.C.                                 |   | DE |

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| M-C                PENN MANAGEMENT TRUST                        |   | MD |
|-----------------------------------------------------------------|--------|----|
| M-C                PLAZA II & III LLC                       |   | NJ |
| M-C                PLAZA IV LLC                                 |   | NJ |
| M-C                PLAZA V LLC                                  |   | NJ |
| M-C                PLAZA VI & VII LLC                       |   | NJ |
| M-C                PLAZA VI LLC                                 |   | NJ |
| M-C                PLAZA VII LLC                                |   | NJ |
| M-C                PROPERTIES CO. REALTY L.L.C.                 |   | NJ |
| M-C                RED BANK REALTY L.L.C.                       |   | NJ |
| M-C                ROCKLAND PARTNERS L.P.                       |   | NY |
| M-C                ROSETREE REALTY, LLC                         |   | PA |
| M-C                TRANSIT, LLC                                 |   | DE |
| M-C                VREELAND, LLC                                |   | DE |
| M-C                WASHINGTON STREET L.L.C.                     |   | DE |
| M-C/SHARK                JV, LLC                                |   | DE |
| MACK-CALI                ADVANTAGE SERVICES CORPORATION         |   | DE |
| MACK-CALI                AIRPORT REALTY ASSOCIATES L.P.         |   | PA |
| MACK-CALI                B PROPERTIES, L.L.C.                   |   | NJ |
| MACK-CALI                BELMAR REALTY LLC                      |   | DE |
|  MACK-CALI                BRIDGEWATER CO., L.P.            |   | NJ |
| MACK-CALI                BUILDING V ASSOCIATES L.L.C.           |   | NJ |
| MACK-CALI                BUSINESS CAMPUS ASSOCIATES, INC.       |   | NJ |
| MACK-CALI                CALIFORNIA DEVELOPMENT ASSOCIATES L.P. |   | CA |
| MACK-CALI                CALIFORNIA PARTNERS L.P.               |   | CA |
| MACK-CALI                CAMPUS REALTY L.L.C.                   |   | NJ |
| MACK-CALI                CHESTNUT RIDGE, L.L.C.                 |   | NJ |
| MACK-CALI                CW REALTY ASSOCIATES L.L.C.            |   | NY |
| MACK-CALI                D.C. MANAGEMENT CORP                   |   | DE |
| MACK-CALI                E-COMMERCE L.L.C.                      |   | DE |
| MACK-CALI                EAST LAKEMONT L.L.C.                   |   | NJ |
| MACK-CALI                F PROPERTIES L.P.                      |   | NJ |
| MACK-CALI                FACILITY, LLC                          |   | NJ |
| MACK-CALI                GLENDALE LIMITED PARTNERSHIP           |   | AZ |
| MACK-CALI                HAMILTON, L.L.C.                       |   | NJ |
| MACK-CALI                HOLMDEL L.L.C.                         |   | DE |
| MACK-CALI                JOHNSON ROAD L.L.C.                    |   | NJ |
| MACK-CALI                MANAGEMENT L.L.C.                      |   | DE |
| MACK-CALI                MATAWAN L.L.C.                         |   | NJ |
| MACK-CALI                MEADOWLANDS CORPORATION                |   | DE |
| MACK-CALI                MEADOWLANDS ENTERTAINMENT L.L.C.       |   | NJ |
| MACK-CALI                MEADOWLANDS SPECIAL L.L.C.             |   | NJ |
| MACK-CALI                MID-WEST REALTY ASSOCIATES L.L.C.      |   | NY |
| MACK-CALI                MORRIS REALTY L.L.C.                   |   | NJ |
| MACK-CALI                PENNSYLVANIA REALTY ASSOCIATES L.P.    |   | PA |
| MACK-CALI                PLAZA I L.L.C.                         |   | NJ |
| MACK-CALI                PROPERTY TRUST                         |   | MD |
| MACK-CALI                REALTY ACQUISITION CORP.               |   | DE |
| MACK-CALI                REALTY CONSTRUCTION CORPORATION        |   | NJ |

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| MACK-CALI                RIVERSIDE REALTY L.L.C.           |   | NJ |
|------------------------------------------------------------|--------|----|
| MACK-CALI                SERVICES, INC.                    |   | NJ |
| MACK-CALI                SHORT HILLS L.L.C.                |   | NJ |
| MACK-CALI                SO. WEST REALTY ASSOCIATES L.L.C. |   | NY |
| MACK-CALI                SPRINGING L.L.C.                  |   | DE |
| MACK-CALI                SUB I, INC.                       |   | DE |
| MACK-CALI                SUB II, INC.                      |   | DE |
| MACK-CALI                SUB III, INC.                     |   | DE |
| MACK-CALI                SUB X, INC.                       |   | DE |
| MACK-CALI                SUB XI, INC.                      |   | DE |
| MACK-CALI                SUB XIV, INC.                     |   | DE |
| MACK-CALI                SUB XV, TRUST                     |   | MD |
| MACK-CALI                SUB XVII, INC.                    |   | DE |
| MACK-CALI                SUB XXI, INC.                     |   | DE |
| MACK-CALI                SUB XXII, INC.                    |   | DE |
| MACK-CALI                SUB XXIII, INC.                   |   | DE |
| MACK-CALI                TAXTER ASSOCIATES L.L.C.          |   | NY |
| MACK-CALI                TEXAS PROPERTY L.P.               |   | TX |
| MACK-CALI                TRANSIT VILLAGE LLC               |   | DE |
| MACK-CALI                TRS HOLDING CORPORATION           |   | DE |
| MACK-CALI                VENTURES L.L.C.                   |   | DE |
| MACK-CALI                WILLOWBROOK COMPANY L.L.C.        |   | NJ |
| MACK-CALI                WOODBRIDGE L.L.C.                 |   | NJ |
| MACK-CALI                WP REALTY ASSOCIATES L.L.C.       |   | NY |
| MACK-CALI-R                COMPANY NO. 1 L.P.              |   | NJ |
| MAIN-MARTINE                MAINTENANCE CORP.              |   | NY |
| MANHASSET                ASSOCIATES L.L.C.                 |   | NY |
| MAPLE                4 CAMPUS REALTY L.L.C.                |   | NJ |
| MAPLE                6 CAMPUS REALTY L.L.C.                |   | NJ |
| MC                HUDSON HOLDING L.L.C.                    |   | NJ |
| MC                HUDSON REALTY L.L.C.                     |   | NJ |
| MC                ONE RIVER GENERAL L.L.C.                 |   | NJ |
| MC                ONE RIVER LIMITED L.L.C.                 |   | NJ |
| MCPT                TRS HOLDING CORPORATION                |   | DE |
| MCPT                TRUST                                  |   | DE |
| MCRC                TRUST                                  |   | DE |
| MC-SJP                PINSON DEVELOPMENT, L.L.C.           |   | DE |
| MID-WEST                MAINTENANCE CORP.                  |   | NY |
| MID-WESTCHESTER                REALTY ASSOCIATES L.L.C.    |   | NY |
| MONMOUTH/ATLANTIC                REALTY ASSOCIATES L.L.C.  |   | NJ |
| MONUMENT                150 REALTY L.L.C.                  |   | DE |
| MONUMENT                HOLDING L.L.C.                     |   | DE |
| MOORESTOWN                REALTY ASSOCIATES L.L.C.         |   | NJ |
| MOUNT                AIRY REALTY ASSOCIATES L.L.C.         |   | NJ |
| MOUNTAINVIEW                REALTY L.L.C.                  |   | NJ |
| OFFICE                ASSOCIATES L.L.C.                    |   | NJ |
| ONE                RIVER ASSOCIATES                        |   | NJ |
| ONE                SYLVAN REALTY, L.L.C.                   |   | NJ |

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| PALLADIUM                REALTY L.L.C.                                 |   | NJ |
|------------------------------------------------------------------------|--------|----|
| PARSIPPANY                4/5 REALTY L.L.C.                            |   | NJ |
| PARSIPPANY                CAMPUS REALTY ASSOCIATES L.L.C.              |   | NJ |
| PHELAN                REALTY ASSOCIATES L.P.                           |   | CA |
| PLAZA                VIII & IX ASSOCIATES L.L.C.                   |   | NJ |
| PRINCETON                CORPORATE CENTER REALTY ASSOCIATES L.L.C.     |   | NJ |
| PRINCETON                JUNCTION METRO OFFICE CENTER ASSOCIATES, INC. |   | NJ |
| PRINCETON                OVERLOOK REALTY L.L.C.                        |   | NJ |
| RAMLAND                REALTY ASSOCIATES L.L.C.                        |   | NY |
| ROSELAND                II L.L.C.                                      |   | NJ |
| ROSELAND                OWNERS ASSOCIATES L.L.C.                       |   | NJ |
| SENTRY                PARK WEST L.L.C.                                 |   | PA |
| SIX                COMMERCE DRIVE ASSOCIATES L.L.C.                    |   | NJ |
| SKYLINE                REALTY L.L.C.                                   |   | NY |
| SO.                WESTCHESTER REALTY ASSOCIATES L.L.C.                |   | NY |
| SOUTH-WEST                MAINTENANCE CORP.                            |   | NY |
| STEVENS                AIRPORT REALTY ASSOCIATES L.P.                  |   | PA |
| SYLVAN/CAMPUS                REALTY L.L.C.                             |   | NJ |
| TALLEY                MAINTENANCE CORP.                                |   | NY |
| TALLEYRAND                REALTY ASSOCIATES L.L.C.                     |   | NY |
| TENTH                SPRINGHILL LAKE ASSOCIATES, LLC                   |   | DE |
| TERRI                REALTY ASSOCIATES L.L.C.                          |   | NJ |
| THE                GALE COMPANY, L.L.C.                                |   | NJ |
| THE                GALE CONSTRUCTION COMPANY, L.L.C.                   |   | DE |
| THE                GALE CONSTRUCTION SERVICES COMPANY, L.L.C.          |   | DE |
| THE                GALE CONTRACTING COMPANY, L.L.C.                    |   | DE |
| THE                GALE INVESTMENT SERVICES COMPANY, L.L.C.            |   | DE |
| THE                GALE MANAGEMENT COMPANY, L.L.C.                     |   | DE |
| THE                GALE REAL ESTATE ADVISORS COMPANY, L.L.C.           |   | DE |
| THE                GALE REAL ESTATE SERVICES COMPANY L.L.C.            |   | DE |
| THE                GALE SERVICES COMPANY, L.L.C.                       |   | DE |
| THE                HORIZON CENTER PROPERTY OWNERS ASSOCIATION, INC.    |   | NJ |
| TRIAD                REALTY ASSOCIATES L.L.C.                          |   | DE |
| TRIAD                REALTY HOLDINGS L.L.C.                            |   | DE |
| TWELFTH                SPRINGHILL LAKE ASSOCIATES, LLC                 |   | MD |
| VAUGHN                PARTNERS L.L.C.                                  |   | NJ |
| VAUGHN                PRINCETON ASSOCIATES L.L.C.                      |   | NJ |
| WEST                AVENUE REALTY ASSOCIATES L.L.C.                    |   | CT |
| WEST-AVE.                MAINTENANCE CORP.                             |   | CT |
| WESTAGE                REALTY L.L.C.                                   |   | NY |
| WHITE                PLAINS REALTY ASSOCIATES L.L.C.                   |   | NY |

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