help me analyze this purchase

[Kelly Stevens]

Hello Please help

This is in a very hot market in one of the best neighborhoods in the city. 

Duplex built in 1946 needing a new roof at some point and refurbish and repaint the outside shingles - 15000$ deferred capital improvement.

Price - $420,000

Gross income would be $28800/year (no vacancy rate - really!!)  - 1200 each so $2400 per month

Operating costs would be $7652/year ( prop tax, insurance maintenance, utilities, landscape) 

down payment 84000 borrow 336000 at 3.6% - 1589 which is $19068/year

So I would net $172/month with an output of $84000.

Would you buy it?