Cheboygan Opera House
Opened: 1877, renovated 1984
The Cheboygan Opera House is on the upper floors of the city hall. In contrast to the trend in NYC of keeping theatre exteriors and gutting the interiors, a 1980s renovation lovingly restored the interior while cladding the building with an unfortunate mansard roof that was the fashion of the time.
Faster, cheaper, better. You can have two of the three.