Is this legal as a 7 unit house? Are you renting by the room? Does that make it a rooming house? Is the property zoned for this? Have you checked on insurance for a rooming house or whatever this is?
If the rental is legal and if the year around rent is $2,800 per month, then this is worth pursuing. If everything else checks out, my max purchase price would be about $140,000 or 70% of the market value, whichever is lower (if I were buying it).