With limited options to sell this property as is, We are weighing the possibility of fixing it up to either rent or sell.  

Single-hung usually next in line, then double-hung... casement/awning windows of comparable size are usually the most costly of the common window types.Be sure to pay attention to the egress needs - while a 2650 DH might meet egress, a 2650 casement may not (or it may need side pivot hardware).I could write a small novel on what to look for when buying windows... however, sleep beckons.

BTW... are there limitations has to how many loans you can have under one name. or am I missing lots of information?  

I assume these systems were mostly updates of old octopus systems (fully gravity fed).Local HVAC guys suggest leaving as-is unless someone wants to put AC in - but if we can avoid limiting the (future) borrowers to non-conforming products, that would be good!

@Daria B  the area where we want to be is very limited for any real estate for sale in my price range.  

I think at worse it is a long term stable area with limited appreciation but I don't expect depreciation.  

I've found the HUD inspections to be very limited, and sometime even incorrect.

Elderly investors should have some test for sophistication and/or limits on investing (10% of wealth?).

One issue giving me some concern is the limited opportunity to force appreciation with this property. 

Now I am looking to shadow an experienced investors from the Pittsburgh area before I start making deals and try to limit some mistakes that come with investing in real estate.