These were hand crafted by the previous owner, and have single panes of glass which rattle on a mild breezy day.

Everyone wants fantastic schools but no one wants the traffic congestion in their neighborhood or their backyard to back up to the school and the property used for the school is a strain on the tax payers.

Does anyone have a lead on where to buy cheap double pane white vinyl windows?

Exterior seals around 4 single pane windows were rotted out.

Thanks for the insight, HML can be costly and out of pocket can put a strain on your re-hab money. 

Break them out by item:          8 windows; installed in existing openings:  Anderson series 70, double-hung, double-pane, low-e, with grids.  

Also one more thing, think about how a strain it would be on your relationship if your generous gesture ends up being a money pit for you...

Although, I have an amazing, albeit expensive, property management team and a have accounted for the higher expenses in my due diligence so hopefully that will reduce some of the strain. 

I also walk through the property with them to show them where the fire extinguishers are, where the breaker panel is, and where the water main shutoff is.

For instance, if 2 out of 5 houses in the area have dual pane windows, she puts in retrofit dual pane windows.