Question on a cash offer, is this a good offer?

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My friend has a townhouse with the intention of selling it a retail buyer for 285k. A cash buyer who seems like he really wants it has been behind the house last two weeks. The area is a booming for rental units. The cash buyer already owns several properties in the area. His starting offer was 255k and now several days later stands at 270k cash. He said he will go easy on the inspections (HVAC is old) and provide and delay closing until my friend finds another house to move. He is saying its a good deal since my friend don't have to pay real estate agent commision. I would like to know your thoughts, is it a good offer, should my friend accept it? Note that we don't know the retail offers yet.