While it's not Strawberry Mansion proper, the big developments in North Philly (West of Broad) are in Brewerytown (I'm not sure if that name was in use in your day - the realtors have repackaged dozens of neighbohoods in recent years to attract buyers!)- around 31st and Thompson.

Just in case you haven't read of it, Westrum Development built nearly 150 new garage townhomes with more planned and smaller scale developers have followed. Here's Westrum's website: http://www.westrumhomes.com/brew/index.html