First buy, what do I need to know? Columbia South Carolina

[Carter Bushman]

Hey everyone, I'm asking on behalf of my mother. She is looking at buying a multi-family, here's the info I have.

Units: 9 (6 mobile homes and a triplex)

Asking Price: $170k

Gross Monthly income: $3,930

Lot Size: 1.31 SF

Cap Rate: 18%

Occupancy: 100%

Operating Expenses: $12k (although the owner does all maintenance himself which my mother certainly won't do.)

What other questions do I need to ask? When my mother walks the lot what should she be looking for? 

Thanks for your help.