4 months is awhile out to be buying, kind of. You could request a 90 day close, if your offer is even accepted, but I dont think that would sit well with the sellers. Typical close of escrow time period is 30-45 days. Then you mortgage is due the on the 1st of the month after the month you move in. Example: If you close escrow on April15th, you will pay prepaid interest pro rated until the end of that month, so 15 days worth. Then the next month is "free", your payment wouldnt be due until June 1st. Because of that, you could request a 60 day close, I guess. That's not unheard of. But if I were you I would wait until you have only a month left on your lease. Then you dont have ANYTHING to pay for that "free" month. Trust me, you will like that, after paying all the closing costs!