Need some pointers on this deal

[Jesse Ramirez]

I'm in the process of evaluating a 21 unit property that consists of mainly 3/1 and 2/1 bedrooms. They are actually 21 duplex like structures spread across an entire block. Only ten are rented and the properties sit within "walking distance" of a major university. I would like to put this property under contract for a possible wholesale.
Here are the numbers,

Asking price:135K
Repairs needed:60k
Avg. rent per unit:300 as of today, suspect this could go up some

Pro Forma according to seller:

Gross Income (21 Units@$7512/mo) $90,144
Less Vacancy and credit loss 10% $9014
Effective Gross Income: $81,130

Less Expenses
Taxes $5709
Insurance $7557
Maintenance (yard included) $5320
Total Expense: $18,586 (23%)
Net Income: $62,544