Silicon Valley has officially planted another flag on the Upper East Side. A Palo Alto-based tech executive, the founder and CEO of application-security firm Data Theorem, and his wife have closed on a five-story limestone townhouse on the Upper East Side for roughly $13.7 million, according to public records. The home sits on a tree-lined block between Madison and Park avenues and had been drifting on and off the market since early 2023 before the deal finally wrapped in late November after a months-long contract process.
What The House Offers
The renovated townhouse clocks in at about 5,600 square feet and is very much in “move in and brag about it” condition. It has six bedrooms, multiple en-suite bathrooms, a media room and a chef’s kitchen that spans nearly an entire floor. Listing materials credit architect Jeffrey Cole and designer Celia Walker for the overhaul and highlight a south-facing garden, high ceilings and custom white-oak finishes, according to Compass.
How The Deal Came Together
The sale price, recorded at about $13.7 million, represents roughly a 25 percent haircut from the townhouse’s original $18.5 million asking price when it first hit the market in 2023, as reported by The Real Deal. Deed and loan filings reviewed by Crain's New York Business show the buyers recorded the purchase in late November and took out a roughly $9.6 million mortgage from JPMorgan Chase.
On the other side of the table, ownership records list Kenmare Consulting Corp. as the seller. That company acquired the property in 2019 for just under $9 million, according to property history on Homes.com.
Who Is The Buyer
The executive founded Data Theorem in 2013 and continues to run the Palo Alto-headquartered application and API security firm. The company says its products are used by large banks, healthcare providers and biotech firms, according to Data Theorem. Industry directories list the founder as CEO since 2013, per Crunchbase.
Publisher listings also note that he has authored several security titles, including “Mobile Application Security” and “Hacking Exposed: Web 2.0,” according to Barnes & Noble.
Where This Fits In The Market
Manhattan’s townhouse scene, which went sleepy for a stretch, has been perking up again in the luxury tier. Some brokers point to a steady drumbeat of single-family deals as evidence that buyers with deep pockets are back in the market for stoops and back gardens.
Heather Domi told Crain's New York Business that townhouse sales have been “on a tear,” averaging roughly three luxury transactions a week. Recent closings have clustered on the Upper East Side, which keeps showing up in the transaction logs that track high-end deals, according to The Real Deal.
The buyers' purchase is one more example of a West Coast tech executive picking up a Manhattan address to round out a bicoastal portfolio. The pair now own a carefully renovated townhouse within walking distance of Central Park and the museum corridor, a setup that is likely to appeal whether they are here for business trips, longer stays or just the bragging rights that come with a prime Upper East Side front door.
Editor's Note: This article has been revised to remove personal identifying information.
