Other mistake: In the opening scene in the office, when Andrew McCarthy says, "Let's go to the beach" and runs off, you can see that the other guy's PC, which he has been working on, has no power cable plugged in.
Other mistake: When the hitman returns to kill Bernie for the last time, he shoots Bernie six times and the revolver is empty as expected. When he pulls out his other .38 revolver to shoot the witnesses, he shoots seven times even though .38 revolvers can only have six bullets. (01:29:00 - 01:32:00)
Answer: Yes it would, but Bernie was a greedy and selfish man, he would have bribed contractors and inspectors to get it built. He wanted to live the life of a big shot. Like "The Wolf of Wall Street."