Office building purchase

[Mohabub Miah]

Good evening everyone I came across a FSBO office building, land contract deal. I wanted to know if I could get advice on purchasing this property and what things to look into before purchase. Little detail building is 6000 sq ft est. about 20 office unit. Rehab needed roof, parking lot, heating system total facelift. I want to purchase knowing it's a good buy. Thank you for your time