I saw your ad displayed on the electronic billboard al Main & Lewis this evening.
It cycled quickly, so I wasn't able to take in everything on the sign, but it was a modern three storey structure like you indicated above, but with a more continuous facade. It looked nice.
The main thing of note that I took from my brief sighting is that according to the advertisement, this building would be a "two minute walk from the Avenir Centre". This really narrows things down in terms of location, and in particular, I am wondering about the recently cleared lots on the north side of Gordon Street between Elm & Highfield. This particular site would appear to suit the style of building depicted on the billboard.