How Hidden Property Owners and Bad Landlord Patterns Are Revealed in NYC

New housing tools in New York City demystify building ownership information and identify problematic landlord behavior. What would it take to replicate them?

3 minute read

March 31, 2022, 5:00 AM PDT

By LM_Ortiz

A block of the Bowery in New York City seen from high above, with taxis and other cars passing on the street in front of the buildings.

Ryan DeBerardinis / Shutterstock

When I type my Brooklyn address into New York City’s property owner search tool, the first result I see is an error message that says no records exist for my building. After several tries—substituting "street" for "st.," then deleting it altogether, then removing the apartment number—it finally returns an actual result: an anonymous LLC, with no other clarifying information.

A different website gives me a more helpful result on my first try: my landlord’s full name, familiar from the dozens of rent checks I’ve written him over the years. I can also see how many evictions have been recorded at the property (zero), how many open violations the building has with the city’s Department of Housing Preservation and Development (one, for a faulty lock), and a list of other buildings my landlord owns nearby.

That second site is Who Owns What, one of several digital tools created by tech nonprofit to empower the city’s renters. Enter the address of a New York City residential building into the Who Owns What search bar and you’ll get clear ownership information and other useful data points, more readily than you’d be able to pull that information from a city or state-run web portal.

Shielding identities behind LLCs is a common practice for landlords in cities across the country, including in New York City, where one building alone in south Williamsburg notoriously serves as the registered address and rent-check-pickup-point for hundreds of anonymous property owners. Having a tool that demystifies building ownership information can help renters take their landlords to court or organize with tenants in other buildings. It also helps policymakers and housing advocates connect the dots of problematic landlord behavior, spotting patterns of harassment and neglect, questionable eviction practices, or over-leveraged property owners across the city.

"Making those connections between buildings has historically been really difficult," says Georges Clement, co-founder and executive director of "Most people will pay rent to 110th Street LLC, rather than the true owner of the building. We try to unmask those owners behind the LLCs and make connections to map out the true ownership portfolios across New York City."

The algorithm that allows JustFix to do so draws registration data from the city Department of Housing Preservation and Development (HPD) in real time to search roughly 170,000 residential buildings for registered owner information. When the tool runs into an anonymous LLC, it gathers "head officer," "individual owner," or "corporate owner" contact information for that LLC (data that is also hosted by HPD), then searches through other HPD records for any additional properties associated with that owner.

For tenants, housing organizers, legal advocates, and reporters, the user-friendly simplicity of Who Owns What makes it a remarkable tool, and far more convenient than sifting through the aforementioned city records.

Of course, these tools are location-specific, reliant on public data available in New York City. Could tech savvy groups outside of New York City replicate JustFix’s success, building similar products to address housing issues in their communities? Here’s how the tools in New York City came to be.

Helping Tenants Build Cases

JustFix got its start ....

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