If goes as planned (always an if), then this should have little financial strain.  

They are not as distressed, look for stuff like single pane windows, older style of trees - there are several shrubs that were extremely popular in the 80s and are not popular now.. look for wheelchair ramps.

I prefer non-paned look windows as they look cleaner and there's less to deal with if you have to repair a window, but it depends on the house.2.

And I for one would much rather pay more for a head of lettuce than pay more in taxes to support the strain on services that illegal immigration brings.

After removing ~5 tonnes of lath & plaster; replacing some structure damaged in a chimney fire in the building's past {estimated to have occurred prior to the 1930s before electricity was installed}; reconfiguring the space layout in half od the house {(re)moving 5 walls}; fixing additional structural and electrical faux pas by the prior owners and levelling the floors, we added ~3 inches of spray foam insulation (R18) into the wall cavities; rewired the house; and replaced all the original single pane, built in-place windows with Energy Star rated, triple-pane, windows {with glazings specific to their orientation}.We put the electric base-board heaters back in-place; by code we need to retain them as an auxiliary heat source to the ductless mini-split heat pump (2 heads) being installed next week.We are now finishing painting and trim.

4 bed 2.5 bath dream home got a complete make over with an open concept kitchen that sparkles with new appliances and quartz countertops, walk in pantry, new double pane windows.

As a minimum, I would encourage a double glazed window with an inert gas (Argon, Krypton) between the panes. 

Original single pane windows with hardwood frames and custom wooden storms outfitted with spring bronze are equally as efficient as double pane vinyl inserts and completely worth saving because they will last 200 years instead of 20.

These are double pane with broken seals, moisture between the panes...ofgift

I have heard Philadelphia has a solid student rental market but would like to keep away from that since these properties don't tend to appreciate much and kids can really put a strain on the properties.