It's more like the building will lack some walls, and there's a pretty good chance it will collapse on itself since they didn't give proper stutting to the second floor.
If you were an architect, I don't think many people would hire you. You should create the design based on how much money you have, not first create the best possible design you can think of, then look at how much of it you can achieve with the money that you have.
Ofcourse, with only $75,000, the house I could build wouldn't be much more than a shack (unless I lived in Parma, Ohio), but it definitely wouldn't lack walls or collapse.
But as I already said... the point is moot, as the full target for Game Master Mode has been achieved.