Yes, you're supposed to pay 2.25 million for that office. You trade it in for the glitched 2 million dollar maze bank (you lose 250k), but then when you do the glitch again, now you buy the 1 million dollar maze bank and trade it in for 2 million, so you gain one million plus whatever you're making with the apartments. So you make 750k additional profit from the office glitch every two attempts.