Looking at the way this is done, it seems like the hardest part of doing this for another city is getting accurate geographic and valuation data in the correct formats.
Since rental units don't have much marginal cost, that seems unlikely -- They are capital investments, financed by mortgages or owned outright.
A quick summary:
The Nutter administration is asking the city's legislative body to pass its Actual Value Initiative (AVI), which would base property taxes on a city-wide reassessment that is supposed to fix years of screwy property values across the city. Many residents would wind up with a lower property tax bill, but many – including longtime residents of more affluent neighborhoods – will pay more, in some cases much more.
http://www.citypaper.net/blogs/nakedcity/Behind-the-curtains...
A funny thing about gmaps and Philly -- Philly's changing so fast that that 'dump' is probably a new renovation by now. The building I live in now still appears on Gmaps in its unrenovated state.
