Advice on Potential 5 Unit Deal - Does it make sense?

[Maximus Decimus]

I am looking at a 5 unit townhome building (each unit has been separated in condos, each unit pays their own utilities). Each unit is 3 bed/2.5 bath and has a attached 2 car garage. Building was built in 1999, and well maintaned. 100% occupied and good rental history last 3 years.

Gross per month is around $5200

I may be able to negotiate down to $500,000 for this property. Using the 50% rule I calculated that this property would cashflow around $450 ($5200 / 2 = $2600 - $2147 (Principal & Interest @ 5% assuming $400,000 loan) = $453

One negative is that the property taxes seem to be high, running about $11,000 per year for the building. There is also maintenance with snow plowing and lawn care since the building is on a 3/4 acre lot.

How does this deal seem? Any opinions would be greatly appreciated.