New electrical, plumbing, and HVAC. 

If you, see if you can find out what previous electric bills and w/s bills are. 

@Bryan Martin - You also need to find out if the units are metered separately or is it master metered and if the owner (potentially you in the future) responsible for any of the expenses as far as the utilities are concerned i.e. electric, gas, water, sewer and trash/dumpsterWith a quad also make sure to get all the expenses (that are applicable) for common area like lighting, sec sys, landscaping, snow removal etc.

Taxes are reasonable, and two significant employers are in the city(Pfizer and Electric Boat).

I hire PM manage the SFH, but I always need to clean the yard after the previous tenant moves out.

I hire PM manage the SFH, but I always need to clean the yard after the previous tenant moves out.

I bet you'd fix that sink in a heartbeat.With younger folks (and us not-so-young Realtors), internet is as critical as electricity. 

You probably know this already but just for the sake of anyone reading this thread who doesn't... regarding electrical: that 70A panel will need to be replaced, especially if it's Federal Pacific Electric (FPE) , Zinsco, GTE-Sylvania, Westinghouse, or contains any stab-loc breakers (usually with with red stickers) which fail to trip and are prone to starting fires. 70A is not enough for modern power consumption as it is, 100A is now the minimum per code, or even better upgrade to 150A or even 200A service since you have AC.

Remembering I do roofing, siding , windows, plumbing, electrical etc.... 

I am living in a cave house (yes, we have electricity and Internet) in southern Spain.