Im looking at buying a 4 plex. Asking price is 229k. A little outdated by appears to be in good condition. Realtor says they could get 725/unit. Currently they have 3 rented and all are on a month to month basis.  I think the tenants are paying sub 600 rents (awaiting the email on some of this info). Its a good location. 3 levels so in my mind you need to be young. Appliances but no washers and dryers. IDK history of roof and hvac yet? Property taxes are about 3700. Its close to my house and I plan to manage myself.

What do I do with tenants that are longterm and not paying market rent rates?

Is this a good deal?