| Old Petaluma Opera House | |
| Location: | 147-149 Kentucky St., Petaluma, California |
| Coordinates: | 38.235°N -122.6408°W |
| Built: | 1870 |
| Architect: | Brainerd Jones |
| Architecture: | Beaux Arts, Stick/Eastlake |
| Added: | December 22, 1978 |
| Refnum: | 78000801 |
The Old Petaluma Opera House (also known as the Maclay Building) is a historic building located in downtown Petaluma, California.
It was built in 1870 as a theater, lecture hall, and dance hall. In 1901, the upper floors were converted to office and meeting space and the street level was remodeled for retail space, and a new prefabricated cast iron facade, manufactured by the Mesker Brothers company of St. Louis, Missouri was installed.
The Nielsen Furniture Company occupied the building from 1944 to 1960.[1] As of June 2010, the building houses law offices and an Irish-style pub. It features Stick/Eastlake architecture.
It was listed on the National Register of Historic Places in 1978.