| Loussac–Sogn Building | |
| Location: | 425 D Street, Anchorage, Alaska |
| Coordinates: | 61.2178°N -149.8889°W |
| Builder: | W. H. Witt Company |
| Architect: | William A. Manley |
| Architecture: | Moderne |
| Added: | May 20, 1998 |
| Area: | less than one acre |
| Refnum: | 98000567 |
| Designated Other1: | Alaska Heritage Resources Survey |
| Designated Other1 Name: | Alaska Heritage Resources Survey |
| Designated Other1 Color: |
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| Designated Other1 Abbr: | AHRS |
| Designated Other1 Number: | ANC-359 |
| Designated Other1 Num Position: | bottom |
The Loussac–Sogn Building is a historic commercial building at 429 D Street in downtown Anchorage, Alaska. It is a three-story Moderne-style building, with storefronts on the ground floor and offices above, with its long side extending along 5th Avenue, and its main entrance, on D Street. The based on the building up to the storefront windows is finished in green tile, while most of the building is finished in concrete. The main entrance has a polished stone surround. Built in 1947, it is one of the oldest surviving Moderne structures in the city, and was the largest office building in the city at its completion. It was planned by Zachariah J. Loussac and Dr. Harold Sogn as a small building to house Dr. Sogn's medical practice, but grew in the design to its more substantial form.[1]
The building was listed on the National Register of Historic Places in 1998.