All right, here’s the deal with Zillow.com:
I decide I’m going to buy you a pair of designer jeans, nothing but the best for you. I know that fit is important, so I go to three of your best friends to get their sizes. Not yours, theirs. I strike a happy medium amidst the diversity, reckoning that — what the heck! — you can’t be that different from your friends.
If the jeans I buy for you actually happen to fit, this will be a happy accident. More likely, the jeans will be a close but not perfect fit.
You understand why, of course. Epistemological error was built into my sizing algorithm. I chose a method that might have been convenient, but which cannot possibly produce objectively accurate results with any degree of confidence. Arguably, the more of your friends I measure, the smaller my margin of error. But I am still pursuing an inherently erroneous sizing methodology.
For Realtors, a perusal of the tax records, the equivalent of a Zillow Zestimate, is the first step in comping, the step known to be least accurate. The next step is comping the house one-for-one with recent past sales and currently-marketed (competitive) listings. The last step is working all those numbers against the subject property in its current state of upkeep and upgrades.
In the same way, if I don’t take a tape rule to your inseam, the chances of my getting jeans that fit your unique physique are very poor.
However: In email, my friend and client Richard Nikoley set me straight on the value of Zillow.com:
I still think it can be used as a valuable tool for getting an idea of the relative values between neighborhoods in places you’ve never been to. Of course, once you determine where you want to buy, based on a number of factors and Zillow being only one input, then you need to begin the real homework.
Plus which, it’s fun to play with. It would be even more fun in Safari.
The map to the right is a Zillow heat map for Greater Phoenix, reflecting not the ambient temperature (115!) but the (approximate!) Read more