Olmstead, Vertex Ink Major Leases in Flatiron District

In a swift demonstration of market confidence, Olmstead Properties and its new office investment venture, Vertex, have secured substantial leasing commitments at their recently acquired Park Avenue South portfolio. The duo finalized approximately 67,000 square feet of new leases across the two Flatiron District buildings, signaling strong demand for quality office space in a dynamic Manhattan submarket. This leasing velocity follows closely on the heels of their $104 million acquisition of the properties in November 2025.

Among the key new tenants is The Corcoran Group, a prominent real estate brokerage, which has committed to an 11-year lease for the entire third floor at 381 Park Avenue South, encompassing 14,710 square feet. The firm is slated to occupy its new space in the summer of 2026, relocating from a nearby TF Cornerstone-managed building. Negotiations for Corcoran were led by CEO Gary Malin, with internal representation provided by Paul Wexler.

Since taking ownership of 373 and 381 Park Avenue South, Olmstead and Vertex have successfully executed eleven leases totaling nearly 57,710 square feet. This includes a significant commitment from AI firm Stuut, which secured 9,043 square feet. To cater to immediate tenant needs, the ownership has also introduced four newly constructed, move-in-ready office suites, ranging from approximately 3,200 to 6,500 square feet, reflecting a strategic response to the market's appetite for flexible, high-quality workspaces.

The acquisition, which saw Olmstead partner with the newly established Vertex platform backed by the Rosenblatt and Arnow families, represented Olmstead's first major real estate move since 2016. The 17-story, 244,000-square-foot building at 381 Park Avenue South, along with its adjacent property at 373 Park Avenue South, was purchased from ATCO Properties & Management. The transaction was supported by approximately $82 million in acquisition financing from Bank of New York, with Empire Capital Holdings retaining a minority interest.

Significant capital improvements have been implemented across both buildings under the new ownership. These enhancements, designed in collaboration with COOKFOX Architects, include modernized lobbies, upgraded elevator cabs, refreshed common areas, and renovated restrooms, alongside the creation of the prebuilt office suites. These upgrades are crucial in attracting and retaining tenants in Midtown South, where average asking rents stood at $84.91 per square foot in February 2026, according to CBRE data.

The successful leasing activity underscores the strategic appeal of the Park Avenue South corridor, a location benefiting from its proximity to Madison Square Park and its accessibility. The partnership between Olmstead, led by Steven Marvin on landlord negotiations, and Vertex, co-founded by Adam Arnow and Patrick Pavone, appears well-positioned to capitalize on the ongoing demand for prime office assets in Manhattan.