BlackRock's 600 Third exit clears on four private checkbooks

The unnamed investor in BlackRock's $245 million sale of 600 Third Avenue is Richard Born, Commercial Observer reported, and his roughly 25 percent stake in the 42-story building between East 39th and East 40th streets says more about how Midtown East office clears in 2026 than the price on the cover does. L&L Infinite — the venture formed by former Silverstein Properties chief executive Marty Burger and L&L Holding's David Levinson — bought the tower with a $185 million acquisition loan from Bain Capital at closing.

The debt does most of the work: subtract the $185 million loan from the $245 million price and roughly $60 million of equity remains against a 1970 building that was renovated in 2015 and 93 percent leased when it traded, making a quarter stake a check of about $15 million before costs and reserves. Equity that size belongs to private balance sheets rather than to institutions, and the buyer list reads accordingly.

Born is identified as a hotel investor, and BD Blakely, one of the co-investors, is an affiliate of BD Hotels, the company he founded with Ira Drukier in 1986; affiliates of Richard Mack's Mack Real Estate Group and BLDG joined the same way, each holding a roughly equal portion. Equal slices arrayed around a 25 percent stake point to a short list of comparable checks rather than a lead buyer with followers behind it — an inference the reported figures support but do not state. A hotel developer buying into a 1970-vintage office tower at about three dollars of debt for every dollar of equity suggests that leased Midtown space looked like the better trade this month.

L&L Infinite, the venture Burger formed after his Silverstein tenure and paired with Levinson, bought this building alongside outside investors rather than out of a commingled fund. The structure that implies — per-deal partners, per-deal leverage, and no redemption queue to answer to — is worth watching precisely because it is the venture's debut acquisition, according to the editor's note accompanying this story.

Bloomberg reported the sale first and left Born unnamed, which is why the identity of the quarter holder is news at all; the building underneath is not a story of empties, with L-3 Communications anchoring it at close to 59,000 square feet, Polsinelli PC signed a ten-year deal in early 2023 that runs through 2036 and expanded to 52,516 square feet, and Aaronson Rappaport Feinstein & Deutsch renewed 42,764 square feet across the entire fifth and sixth floors in February 2025.

Bain's appearance on the debt is where an alternative manager touches this trade, and the reporting stops there; neither the loan's pricing nor its term is described. What is described is the brokerage work: Newmark's Jordan Roeschlaub arranged the loan alongside Bain, and Newmark's sale team of Adam Spies, Adam Doneger, Josh King, Marcella Fasulo, Avery Silverstein and Doug Harmon ran the transaction.

For roughly 20 years BlackRock carried a 99.5 percent stake in 600 Third and L&L Holding carried 0.5 percent; Levinson's firm now gives its name to the venture taking the other 99.5 percent, which suggests the incumbent minority traded a passive stake for the sponsor's chair — the move from passive minority to operating sponsor that this publication flagged when CalSTRS put $5 billion to work and aimed its largest check at an account it controls outright.

The seller's reason, per one source, is capital recycling, and the length of the hold fits that account: two decades of ownership ending in a sale where the buyer supplied a quarter of the price in equity. The basis at which BlackRock carried the building is not in the reporting, so nobody outside the deal can say whether $245 million cleared above or below the mark.

Two other owners are testing the same avenue: SL Green Realty is pricing 711 Third Avenue at about $160 million, and Fisher Brothers' 605 Third Avenue is going to market at roughly $425 million, both through Newmark — the same brokerage that ran 600 Third. Three price tags on one corridor, arriving in the same season and carried by one intermediary, will do more to establish what Midtown East office is worth than any single trade can.

Office finds a clearing price only where a trade prints, and alternative credit has increasingly stepped into ownership when one does. The print at 600 Third supports the first half — a 99.5 percent holder exiting after 20 years at 93 percent occupancy, on the same logic that let a South Bay tower carry a larger refinancing while Los Angeles vacancy held at 25.3 percent — and cuts against the second. Bain supplied three quarters of the price as debt and took no ownership, and the equity went to an operator and its co-investors, which leaves alternative credit financing the clearing trade rather than becoming it.

The template is what matters. If the L&L Infinite structure — a sponsor with the name, private balance sheets with the equity, an alternative lender with the debt — becomes the standard for well-leased Midtown towers, the neighborhood's clearing price will keep being set by whoever will write a $15 million check behind a $185 million loan. The institutions that left office will not come back for a 93 percent leased building, which means the private capital that replaced them will price the next one.

That makes 711 Third and 605 Third the informative trades. Both are Newmark mandates, both will be read against BlackRock's exit, and together they will show whether $245 million was the floor a syndicate had to pay for occupancy or the ceiling a 20-year holder could still get. Trade near the marks and a 93 percent leased tower was cheap. Linger into next year and BlackRock sold into the last bid.