| | DESIGN-BUILD CONSTRUCTION SERVICES TO REPAIR NORTH PARKING STRUCTURE AT THE MARK CENTER | ADDON SERVICES LLC | $3,750,000 | WASHINGTON HEADQUARTERS SERVICES (WHS) | WASHINGTON HEADQUARTERS SERVICES (WHS) | — | 237310Highway, Street, and Bridge Construction | Z2LZREPAIR OR ALTERATION OF PARKING FACILITIES | Sep 30, 2025 | Sep 29, 2025 | Aug 24, 2027 |
| | DESIGN-BID-BUILD CONSTRUCTION TO REPAIR RETAINING WALL | ADDON SERVICES LLC | $9,430,246 | WASHINGTON HEADQUARTERS SERVICES (WHS) | WASHINGTON HEADQUARTERS SERVICES (WHS) | — | 237310Highway, Street, and Bridge Construction | Z2LZREPAIR OR ALTERATION OF PARKING FACILITIES | Sep 27, 2024 | Sep 27, 2024 | Aug 31, 2026 |
| | DESIGN-BUILD CONSTRUCTION FOR UPGRADE OF NORTH ROTARY ROAD FERN VEHICLE ACCESS CONTROL POINT FENCE | ADDON SERVICES LLC | $3,042,425 | WASHINGTON HEADQUARTERS SERVICES (WHS) | WASHINGTON HEADQUARTERS SERVICES (WHS) | — | 237310Highway, Street, and Bridge Construction | Z2LZREPAIR OR ALTERATION OF PARKING FACILITIES | Sep 17, 2024 | Sep 24, 2024 | Feb 17, 2026 |
| | C115956 - HVAC, ELECTRICAL AND ARCHITECTURAL RENOVATIONS TO SELF SERVICE STORE [24-004628] | ADDON SERVICES LLC | $705,211 | NATIONAL INSTITUTES OF HEALTH | NATIONAL INSTITUTES OF HEALTH | — | 236220Commercial and Institutional Building Construction | Z1HBMAINTENANCE OF GOVERNMENT-OWNED GOVERNMENT-OPERATED (GOGO) R&D FACILITIES | Sep 11, 2024 | Sep 12, 2024 | Aug 3, 2026 |
| | NIH_C200097 - BUILDING 101, F MODULE, REPLACE AHU-SZ-F-AD-10 AND AHU-SZ-F-AD-11 [24-004312] | ADDON SERVICES LLC | $1,465,384 | NATIONAL INSTITUTES OF HEALTH | NATIONAL INSTITUTES OF HEALTH | — | 236220Commercial and Institutional Building Construction | Z1HBMAINTENANCE OF GOVERNMENT-OWNED GOVERNMENT-OPERATED (GOGO) R&D FACILITIES | Aug 22, 2024 | Aug 22, 2024 | Jul 24, 2026 |
| | DESIGN-BUILD CONSTRUCTION UPGRADE WEST END SECURITY FENCE | ADDON SERVICES LLC | $3,243,111 | WASHINGTON HEADQUARTERS SERVICES (WHS) | WASHINGTON HEADQUARTERS SERVICES (WHS) | — | 237310Highway, Street, and Bridge Construction | Z2LZREPAIR OR ALTERATION OF PARKING FACILITIES | May 14, 2024 | Jun 3, 2024 | Nov 18, 2025 |
| | MINIMUM GUARANTEE - ADDON SERVICES | ADDON SERVICES LLC | $5,000 | DEPT OF THE NAVY | DEPT OF THE NAVY | — | 236220Commercial and Institutional Building Construction | Y1JZCONSTRUCTION OF MISCELLANEOUS BUILDINGS | Apr 11, 2024 | Apr 11, 2024 | Apr 10, 2029 |
| | C109439 - DB CONTRACT BUILDING 101 F MODULE & MRI - REMOVE FIRE PUMP & ENHANCE FIRE SPRINKLER SYSTEM | ADDON SERVICES LLC | $933,842 | NATIONAL INSTITUTES OF HEALTH | NATIONAL INSTITUTES OF HEALTH | — | 236220Commercial and Institutional Building Construction | Z1HBMAINTENANCE OF GOVERNMENT-OWNED GOVERNMENT-OPERATED (GOGO) R&D FACILITIES | Sep 20, 2023 | Sep 20, 2023 | Aug 22, 2025 |
| | C106467 - IPI/NEURO F071-F075, RTP, ALISON KARVER [23-004989] | ADDON SERVICES LLC | $4,742,362 | NATIONAL INSTITUTES OF HEALTH | NATIONAL INSTITUTES OF HEALTH | — | 236220Commercial and Institutional Building Construction | Z1HBMAINTENANCE OF GOVERNMENT-OWNED GOVERNMENT-OPERATED (GOGO) R&D FACILITIES | Aug 24, 2023 | Aug 24, 2023 | Jun 30, 2025 |
| | C105342-NIEHS BLDG 101 E MODULE ROOF REFURBISHMENT NEEDED TO PREVENT STRUCTURAL DAMAGE-ALISON KARVER | ADDON SERVICES LLC | $2,422,618 | NATIONAL INSTITUTES OF HEALTH | NATIONAL INSTITUTES OF HEALTH | — | 236220Commercial and Institutional Building Construction | Z1HBMAINTENANCE OF GOVERNMENT-OWNED GOVERNMENT-OPERATED (GOGO) R&D FACILITIES | Jul 19, 2023 | Jul 19, 2023 | Jul 31, 2026 |
| | WCDAS FEEDER SPLICE REPAIRS | ADDON SERVICES LLC | $1,388,800 | NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION | NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION | — | 238210Electrical Contractors and Other Wiring Installation Contractors | Z1JZMAINTENANCE OF MISCELLANEOUS BUILDINGS | Feb 13, 2023 | Feb 13, 2023 | Feb 12, 2024 |
| | PROGRAM SUPPORT COORD AND PREVENTION | ADDON SERVICES LLC | $1,523,863 | DEPT OF THE ARMY | DEPT OF THE ARMY | — | 624190Other Individual and Family Services | R699SUPPORT- ADMINISTRATIVE: OTHER | Oct 31, 2022 | Nov 1, 2022 | Oct 31, 2027 |
| | TOTAL MAXIMUM DAILY LOAD AND PAVING INDEFINITE-DELIVERY INDEFINITE-QUANTITY CONSTRUCTION CONTRACT MINIMUM GUARANTEE | ADDON SERVICES LLC | $10,000 | WASHINGTON HEADQUARTERS SERVICES (WHS) | WASHINGTON HEADQUARTERS SERVICES (WHS) | — | 237310Highway, Street, and Bridge Construction | Z2LZREPAIR OR ALTERATION OF PARKING FACILITIES | Sep 27, 2022 | Sep 27, 2022 | Sep 26, 2032 |