Zillow’s challenges in buying and selling homes are calling into question the reliability of the company’s so-called Zestimates, which provide an estimate of a home’s value based on a proprietary formula. Zillow says a Zestimate is published for around 100 million homes nationwide.
Mentioned Faculty

Tomasz Piskorski
- Edward S. Gordon Professor of Real Estate
- Finance Division
Tomasz Piskorski is the Edward S. Gordon Professor of Real Estate in the Finance Division at Columbia Business School. He is also a Research Associate at the National Bureau of Economic Research and serves on the Academic Research Council of the Housing Finance Policy Center at the Urban Institute. Professor Piskorski earned a M.S. in Mathematics from New York University Courant Institute of Mathematical Sciences and a Ph.D. in Economics from New York University Stern School of Business.