Off-market deal breakers

[Andre Medeiros]

I met someone who is looking to sell a multifamily way under market value. I'm doing my due diligence now. What red flags or hidden traps should I be looking for? Second leans, structural issues, terrible neighborhoods; these are just a few things that Iv looked into and they all seem good/non existent. What am I missing that could come back and bite me in the *** after I close? Much appreciated.