From the Evening Record – February, 1914:
The first three-story building for the new business section on Pitt Street between Goyeau and Ouellette avenues, will be erected by Mr. Peter Osterhout. Plans have been prepared by Leybourne & Whitney, architects. Clay brick will be used in the construction.
Looks like this one sat where the parking garage is today, or possibly the Dean Martini’s site, although the dimensions don’t match. There were a lot of good looking buildings downtown at one time. I’m going to put this one into the realm of lost Windsor.