no one will do good to no one. So look for what’s in for him and what’s in for you. find value of land there from his competitor How many flats he is taking and how many you. who holds registration. Dont sign any papers. He has to finish the building in 18 months and pay your rent and pay cash and ownership of flats.
Get everything on contract. Take blank cheques for rent from him. Protect your self legally.