Allen Buchanan answers: Should I buy this building?

I received a call from an attorney last week. We recently completed a lease for his law firm and we sometimes swap referrals. This time, the conversation centered around an opportunity he presented. In short, a friend of his is eyeing a building and approached my friend on becoming a partner. The counsel I gave the counselor was column worthy – so here it goes.
First, compute the potential revenue.In this case, my friend was not going to occupy the building with his business. So, the oppor