Flames shot through the roofs of at least four condo buildings still being built on River Drive South.
The fire broke out just before 5 a.m. and burned for hours.
Firefighters had limited access the fire because of unplowed streets in the unfinished complex, and then had to run water lines through the snow and slush.
The cause of the fire is under investigation.
The complex boasted 11 new homes, as well as a clubhouse, to be completed by summer.
Some are occupied, but the row of homes that burned were only recently completed or still under construction.