.- no appliances- renter provided window ac units.You actually REDUCE turn over because the effort to move all that stuff that the renter now owns is high.  

My tenant refuses to pay for the window broken when her ex-boyfriend threw a rock through it, when me lease says she is responsible for anyone she knows!"  

If it's too emotional to see the grass die, your window screens disappear and a bunch of crap be in the yard, then maybe reconsider, ya know?  

However, if one was to sell one's property to an FHA buyer, there's a 90-day window the property should have title transferred multiple times.

While the building is sound proof, you still get some train noise from the windows. 

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You can do the once in a lifetime restoration for a property you still own as a rental, but ONLY IF IT'S PAID OFF according to the slides I just found.

Then there will be the energy calcs, etc. required for adding any new windows, etc.

I am looking for a ballpark estimate on how significant new vinyl windows will affect the value of the home?  

Depending on who you find for the window replacement I would generally figure at least 2k minimum to have a window that is to code.