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How can I get Zestimate GIS data for research?

I am conducting research at the undergraduate level which focuses on the impact of parking and vacant lots on property values in a downtown area. 

How can I get zillow zesitmate data for ten different boroughs/cities in the Greater Philadelphia Area?

I have not been funded, but I might be able to afford it if not too expensive.

Andrew Van Leuven
Brigham Young University
  • January 14 2014 - Phoenixville
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Answers (3)

Profile picture for Blue Nile
By the way, anyone that has looked at the concept of "transit oriented development" and "mixed use development" knows that too little parking lowers property values and creates congestion and drives away retail business, and that too much parking causes unnecessary traffic, discourages walking, and discourages the use of transit systems.

So, there is a proper balance of parking to Zoning designation uses, but that balance is a bit tricky to find.  Shared parking tends to be quite helpful.  Free parking for limited time periods also is helpful.  Mandating Employees park away from the business to leave the parking for customers is also helpful.

But to do a proper study, you not only need to know the zoning requirement for the parking for each usage, but you also need to have the data on how many parking places each property and business and business usage and housing usage provides.

The place to find that data is at your local planning department.  They have it, and are working with it on a regular basis.  Some of that data they collect from the county records via 3rd party data companies.  Some they get from building permits and occupancy permits and business permits and conditional use permits.  Some they get from their own surveys, or surveys they contract out.

A commercial Realtor may also be able to give you better data on present values in the area.

I would sit down with someone at your local planning department first and discuss your research goals and objectives, and what data they may already have, and how any research you do might benefit them.  They have lots of experience.
  • January 14 2014
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Profile picture for Blue Nile
You may also want to have a look at Zillow's shape files for neighborhoods and other data regions.

http://www.zillow.com/howto/api/neighborhood-boundaries.htm

Pennsylvania Neighborhood Boundaries

No cost to use the shape files, but again, you must properly reference your source, and if on a website, there must be a Zillow logo and link back to the Zillow page where the shape files were obtained.
  • January 14 2014
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Profile picture for Blue Nile
Zillow doesn't offer the data in the format you are requesting and it would not be beneficial for your stated research anyway as most property in downtown areas is "commercial" or "multi-family" or "mixed use" and Zillow doesn't estimate values for any of those types of properties.

Google may have some better GIS data to offer you in terms of business locations, types of business...  And Google has a fairly easy to use map interface for website developers that want to use their map bases and data.
maps.goggle.com

See homesand.net for a sample of how Google map bases are used on a research website.

Zillow offers all kinds of aggregate data for research for "free".  No cost, just proper citing of sources.  See the Zillow terms use.

The aggregate data can be accessed through the "local info" pages link at the top of the page, or from the Zillow research blog page:
http://www.zillow.com/blog/research/data/

Don't see a specific aggregate data set that you need?  You can request it from their research department, but their agreements with the various data provider companies they contract with does not let them give out property specific data in bulk, even if it is just machine generated estimates that have a +/-20% tolerance margin that change every other day.
  • January 14 2014
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