L&L Infinite Acquired Manhattan Office Tower

The firm purchased the 42-story building at 600 Third Ave. for $245 million.

Updated on Oct. 13, 2026 in Commercial

Isometric editorial illustration of a tall rectilinear office skyscraper with repeating window bays in teal and slate tones. — L&L Infinite has purchased the 42-story office building at 600 Third Avenue in Manhattan for $245 million. AI Illustration. Upload story photo >

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L&L Infinite has acquired the 575,254-square-foot office tower located at 600 Third Ave. in Manhattan for $245 million. The firm finalized the purchase through a joint venture with Mack Real Estate Group, BLDG, and BD Blakely.

Why it matters

The investment group moved to secure the asset citing the strengthening New York office leasing market and the building's historical durability. The property has maintained an occupancy rate above 90% for the last two decades.

The 42-story office tower at 600 Third Ave. encompasses 575,254 square feet and is currently 92% leased. The buyer secured a $215 million acquisition loan from Bain Capital to facilitate the deal.

The players

L&L Infinite

This investment firm spearheaded the joint venture to acquire the Manhattan office property.

Mack Real Estate Group

This company is a partner in the joint venture that purchased the 600 Third Ave. tower.

Bain Capital

This financial institution provided the $215 million acquisition loan for the transaction.

Newmark

This firm served as the representative for the seller and assisted with equity and debt transactions.

The details

Built in 1970, the property sits between East 39 and East 40 streets in the Grand Central district. Investors are currently designing a new tenant amenity floor that will feature a lounge area and a wrap-around terrace.

The office tower was originally built in 1970.
L&L Infinite completed the acquisition in October 2026.

Culture Shift

This acquisition reflects a broader shift toward institutional investment in established office assets with durable tenant histories. It signals confidence in the resilience of the Grand Central district office market as owners pivot to upgrade traditional spaces with modern amenities.

Tenants currently leasing space in the building may see changes to property management as the new ownership group implements planned upgrades. The addition of the new amenity floor and lounge area is intended to improve the workspace experience for local businesses.

The takeaway

Large-scale commercial real estate deals often prioritize buildings with long-term, stable occupancy over newer developments. Investors continue to enhance existing properties with modern amenities to remain competitive in major urban markets.