New landlord, exciting ideas, but....

So a regular customer who invests in real estate came in last week with another guy. Turns out the regular customer has been scouting us, and the guy he was with and he are buying the center we are located in. He says he wants us to become the focal point of the center, he wants to move us to double the sq feet and keep our rent the same, plans to rehab the whole center. It sounds great, but there is nothing on paper yet. Does anyone have experience with this? How are these deals usually structured? The center was listed for 20 million and it looks like it’s going for 7.

If he’s going to pay for the build out then go for it, you could have a lawyer right this all up in a lease agreement for a few hundred bucks