I think house prices can be *very* localized. I bought my place in Central Square a few months ago for exactly the same price as my friend paid for it in June 2006, which in theory was around the top of the housing price bubble... yet my assessor assessed this place as being worth more than I paid for it. It could just be that she got a really good deal, except that a similar unit in the same 3-family sold in 2007, for a comparable price. Just think that within a couple of blocks of Central Square, housing prices have stayed stable. I wouldn't be surprised if the same holds true for Davis. For example, I think volatile gas prices tend to push housing value away from places where people commute by car, and towards T stops, so Davis/Porter might've absorbed some housing value that, say, east Somerville might've lost.