Summerset at Frick has condos and townhouses available right now and new single family homes are being built, but usually take 8mos to 1yr to complete. They will be starting a new phase very soon.
I would also add Swisshelm Park (technically Squirrel Hill, but not in the main business district). It is a very supportive, attractive neighborhood where you could walk safely. (You'd need to drive or take a bus to get to the main shopping areas, though). There is also Sommerset at Frick, though you'd have to catch a resale listing to get in there.
Having said that, one area I would recommend would be Squirrel Hill in Pittsburgh's East End. It has a modest but thriving business district (shops, restaurants, coffee shops, banks, food stores, library) and is in close proximity to two parks - Schneley and Frick. Many tree-lined residential streets.
Regent Square may also be a good choice, although the business district is realtively small - but close proximity to Frick Park.
If you're looking for larger shopping areas (i.e., malls), some areas of North Allegheny County (Ross Park, for one) may interest you.
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