Prosperity Partners, a Chicago-based tax and accounting firm, has locked in a deal for the entire 11th floor at 575 Madison Avenue in Midtown Manhattan, trading its current New York digs at 460 Park Avenue for a larger, consolidated perch in the Plaza District. The move puts all of the firm’s New York operations on a single floor, giving it roughly 24,400 square feet and signaling that mid-sized professional-services tenants are still hunting for renovated, full-floor setups.
As reported by New York Business Journal, Prosperity Partners signed a 10-year lease for the 11th-floor suite and will relocate staff into the full-floor space. That report also notes the tenant will share the new offices with Client Quality Branded, a branding-services operator slated to take a portion of the footprint.
What the Lease Covers
According to Commercial Observer, the 11th-floor suite clocks in at about 24,426 square feet, with CBRE’s Gregg Rothkin leading the landlord’s leasing team on the transaction. On the tenant side, Newmark and Colliers represented Prosperity Partners in the negotiations, while Steinberg & Pokoik owns and manages the building.
Why the Timing Matters
The deal lands amid a broader pickup in Manhattan leasing activity. CBRE’s Q1 2026 office-market report points to rising demand for Class A and Plaza District product, along with a modest uptick in asking rents. In that climate, full-floor commitments in renovated Midtown properties have become an appealing way for firms to secure contiguous space and offer upgraded workplaces to employees.
Commercial Observer notes that 575 Madison has been busy on the leasing front, with other tenants, including Makeup by Mario, taking full floors in the building last year as ownership marketed refreshed space to professional and consumer-facing users. Prosperity Partners and the tenant brokers did not immediately return requests for comment, the New York Business Journal adds.
