I'm going to be honest, the geometry looks easy to create, the texture maps looks a little repetitive. If you created the texture maps, then it depends on the quality (and resolution) of the maps, perhaps they should be in a separate pack.
I think you are on the right track with regards to building creation, as there is a full interior, that's a plus worth mentioning.
For the exterior (façade especially) I think you have a good rough model that needs some more detail before it is worth the $45, perhaps improvements to the windows and doors, some drain pipes, perhaps a fire escape, perhaps a route up to the roof. In particular the doorway and stairs at the front look too simple. The colour scheme could be reviewed too, I think the grey at the edges and separating the floors looks too similar in colour to the walls. Also perhaps there could be some air vents and plumbing pipes.