Advice on purchasing property from my current landlord

[Stuart Gardner]

Hey BP Community,

I currently rent a unit in a 4 unit apartment. The tenant above me is being evicted, and the other 2 have been there for years. The landlord is an elderly couple, who have multiple units around the area, however i think property management and being a landlord may have become to much for them. (The roof started to leak after a bad winter and it took them several months with repeated letters and pictures before they did anything.) However, other than needing a good face lift the property seems pretty solid. 

My question is, does anyone have any advice on approaching/purchasing property from their landlord? 

Thanks