A 1910 Park Slope two-unit rowhouse where Fourth Avenue street activity and air quality shape the living experience.
A two-unit Park Slope townhouse built in 1910 where the building itself keeps out of filings, leaving Fourth Avenue commercial and street conditions to set the tone. Three things to know:
Street-level activity is concentrated along the surrounding blocks. 203 encampment calls within three blocks over the last year, alongside 69 homeless-assistance requests. That reflects heavy foot traffic and street activity along Fourth Avenue right outside.
Air quality calls indicate commercial venting nearby. Four indoor air quality calls were logged within three blocks over the last year, with the last seen on May 9, 2026. Odors and fumes along commercial avenues often travel through shared intakes or open windows.
Curb space turns over fast along the avenue. 175 illegal-parking calls within three blocks in the past 12 months, driven by 49 posted sign violations and 41 blocked hydrants — commercial drop-offs and short errands rather than stored cars.
Quieter signals on this building and the blocks around it:
638 4th Avenue is a two-family home in Brooklyn, New York City (BBL 3006330035). This building is associated with Helen Diaz. Brix does not yet have a current violation read for this property (not enough recent data), along with inspection history, DOB filings, tenant complaints, and rent stabilization status.
Built in 1910, this two-family home sits in Brooklyn and is tracked by Brix using public NYC records from HPD, DOB, ACRIS, and 311.
The building last changed hands on April 27, 1995, according to recorded deeds.
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See every NYC building owned by Helen Diaz on the landlord portfolio page.
Part of Sunset Park — see violations, complaints, and landlord activity across the whole neighborhood.
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