| | DWRC: RESTORE EXTERIOR CAST IRON FENCING. | AEON PRESERVATION SERVICES, LLC | $382,921 | SMITHSONIAN INSTITUTION | SMITHSONIAN INSTITUTION | — | 236220Commercial and Institutional Building Construction | Z1JAMAINTENANCE OF MUSEUMS AND EXHIBITION BUILDINGS | Aug 14, 2025 | Aug 14, 2025 | Mar 31, 2026 |
| | NZP-DC ASSESS AND DOCUMENT HOLT HOUSE (PN 2333108). | AEON PRESERVATION SERVICES, LLC | $58,906 | SMITHSONIAN INSTITUTION | SMITHSONIAN INSTITUTION | — | 236220Commercial and Institutional Building Construction | Z1JAMAINTENANCE OF MUSEUMS AND EXHIBITION BUILDINGS | Sep 12, 2023 | Sep 12, 2023 | Dec 31, 2023 |
| | REVITALIZE HISTORIC CORE. | AEON PRESERVATION SERVICES, LLC | $482,335 | SMITHSONIAN INSTITUTION | SMITHSONIAN INSTITUTION | — | 236220Commercial and Institutional Building Construction | Z1JAMAINTENANCE OF MUSEUMS AND EXHIBITION BUILDINGS | Jun 7, 2023 | Jun 7, 2023 | Nov 22, 2025 |
| | DESIGN SERVICES FOR REPAIR TO THE EXTERIOR SE & SW MAIN BLDG - NMNH | AEON PRESERVATION SERVICES, LLC | $1,079,667 | SMITHSONIAN INSTITUTION | SMITHSONIAN INSTITUTION | — | 236220Commercial and Institutional Building Construction | C1JAARCHITECT AND ENGINEERING- CONSTRUCTION: MUSEUMS AND EXHIBITION BUILDINGS | Sep 20, 2022 | Sep 20, 2022 | Feb 6, 2027 |
| | HMSG: EVALUATE HIRSHHORN PLAZA SIGNIFICANCE. | AEON PRESERVATION SERVICES, LLC | $38,295 | SMITHSONIAN INSTITUTION | SMITHSONIAN INSTITUTION | — | 236220Commercial and Institutional Building Construction | Z1JAMAINTENANCE OF MUSEUMS AND EXHIBITION BUILDINGS | Apr 13, 2022 | Apr 13, 2022 | Sep 30, 2023 |
| | NMNH: PROVIDE ASSESS & DOCUMENTATION, HISTORIC REGISTRATION. | AEON PRESERVATION SERVICES, LLC | $53,237 | SMITHSONIAN INSTITUTION | SMITHSONIAN INSTITUTION | — | 236220Commercial and Institutional Building Construction | Z1JAMAINTENANCE OF MUSEUMS AND EXHIBITION BUILDINGS | Nov 18, 2021 | Nov 18, 2021 | Aug 15, 2022 |
| | RGA: REPAIR FENCE. | AEON PRESERVATION SERVICES, LLC | $868,476 | SMITHSONIAN INSTITUTION | SMITHSONIAN INSTITUTION | — | 236220Commercial and Institutional Building Construction | Z1JAMAINTENANCE OF MUSEUMS AND EXHIBITION BUILDINGS | Mar 23, 2021 | Mar 23, 2021 | Oct 30, 2030 |
| | GWMP- MOCK-UPS AT ARTS OF WAR, VALOR | AEON PRESERVATION SERVICES, LLC | $23,638 | NATIONAL PARK SERVICE | NATIONAL PARK SERVICE | — | 541990All Other Professional, Scientific, and Technical Services | Z1JZMAINTENANCE OF MISCELLANEOUS BUILDINGS | Sep 17, 2020 | Sep 17, 2020 | Dec 18, 2020 |
| | GRAFFITI REMOVAL FROM RFK BUILDING | AEON PRESERVATION SERVICES, LLC | $12,500 | OFFICES, BOARDS AND DIVISIONS | OFFICES, BOARDS AND DIVISIONS | — | 561790Other Services to Buildings and Dwellings | Z1AAMAINTENANCE OF OFFICE BUILDINGS | Jun 10, 2020 | Jun 10, 2020 | Jun 19, 2020 |
| | HMSG: REPLACE EXTERIOR PANELS AND ROOF. | AEON PRESERVATION SERVICES, LLC | $21,680 | SMITHSONIAN INSTITUTION | SMITHSONIAN INSTITUTION | — | 236220Commercial and Institutional Building Construction | Z1JAMAINTENANCE OF MUSEUMS AND EXHIBITION BUILDINGS | Apr 13, 2020 | Apr 13, 2020 | Jun 12, 2020 |
| | NZP-DC: CONSERVE ARCH HERITAGE BLDG'S 015&017 RDC. | AEON PRESERVATION SERVICES, LLC | $419,195 | SMITHSONIAN INSTITUTION | SMITHSONIAN INSTITUTION | — | 236220Commercial and Institutional Building Construction | Z1JAMAINTENANCE OF MUSEUMS AND EXHIBITION BUILDINGS | Apr 9, 2020 | Apr 9, 2020 | Oct 1, 2020 |