A 1915 South Slope townhouse held long-term by the same owners on a active residential block.
A single-family South Slope townhouse built in 1915 that has stayed under the same private ownership since purchasing it in 2010 for $630,000. Single-family homes generate almost no administrative code filings, so evaluating this house comes down to physical mechanicals and block context. Three things to know:
Long-term ownership keeps administrative paperwork minimal. The house last transferred in 2010 for $630,000 and has remained in private hands since. Because single-family townhouses lack common spaces or shared tenant infrastructure, city agency filings are naturally minimal. Your focus should be entirely on physical mechanical health and structural upkeep.
Indoor air quality calls show up on the surrounding blocks. Within three blocks, city systems logged 3 indoor air quality complaints in late 2025. Vapors, fumes, or venting odors can drift between adjacent structures or rise from nearby street-level retail, making air circulation and window seals worth checking during an in-person walk-through.
Curbside friction and unpermitted work activity mark the surrounding streets. Within three blocks of the property, street-level activity includes 101 illegal parking complaints—primarily posted sign violations and blocked hydrants—and 64 general construction complaints over the last 12 months. The house itself carries no active filings, while the surrounding block reflects typical neighborhood turnover.
Quieter signals on this building and the blocks around it:
403 18th Street is a single-family home in Brooklyn, New York City (BBL 3008750069). This building is associated with Marquez, Alex. 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 1915, this single-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 August 27, 2010 for $630,000, according to recorded deeds.
Brix score: 100/100. View the Building Report on Brix.
See every NYC building owned by Marquez, Alex on the landlord portfolio page.
Part of Park Slope — see violations, complaints, and landlord activity across the whole neighborhood.
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