True, you'd probably do better on a price/sq. ft basis if the 400 block of south 48th were in the catchment, but you shouldn't have too much trouble finding a buyer for the property-- I know the block pretty well: I'm assuming sunporch, rear deck, garage, and maybe a finished basement?
If you target Center City buyers who might be considering neighborhoods like the Art Museum Area, Fishtown, or Graduate Hospital, you're project is likely to stand out as offering a bit more value in terms of price/sq. ft, access to public transportation and perhaps even short/long term prospects for appreciation. (Who knows--the catchment area could shift out eventually, or maybe there will be a high school serving a wider geographic area sometime soon?)
Anyway, here's the pitch. (You knew it was coming :) I think Re/Max City Space and I (as a U-City resident) are particularly well prepared to help you accomplish the efficient sale you're looking for.
You can learn a little more about our approach at http://philadelphiarealestatehub.com/cityspace-sells.
Whether you're planning to list with an agent or not, I'd be happy to get a look and offer some feedback on the property sometime soon...