Long Island's office vacancy rate fell to 11.8 percent in the second quarter of 2026, down 90 basis points from a year earlier and below 12 percent for the first time since the spring of 2020. That is the headline, and it is genuinely good news. It is also not entirely the news it appears to be.

Vacancy is a fraction. It improves when the numerator falls, meaning tenants take space, and it also improves when the denominator falls, meaning buildings stop being offices. Long Island is currently doing both, and the second one is doing more of the work than most summaries of a falling vacancy rate would suggest.

The numbers, per Cushman & Wakefield

Overall vacancy: 11.8 percent, down 90 basis points year over year. Nassau sits at 11.0 percent, Suffolk at 13.2 percent. Western Nassau is the tightest submarket on the Island at 9.7 percent.

Sublease vacancy, the leading indicator that told the whole story of 2021 and 2022, is down to 2.0 percent, about 700,000 square feet. Companies are no longer trying to quietly hand off space they signed for and stopped using.

Leasing volume year to date is 822,935 square feet, up 2.9 percent from the same point last year, and split almost exactly down the middle between the two counties, 49.8 percent Nassau to 50.2 percent Suffolk. Occupancy gains for the year run 359,529 square feet, with tenant demand outpacing new supply for a second consecutive quarter.

Rents are doing two different things at once

The Island-wide average asking rent is $33.35 per square foot, off 14 cents for the quarter. Flat, in other words.

Underneath that flat average, the market is pulling apart. Western Nassau's average asking rent rose $1.68 in a single quarter to $40.21, the first time that submarket has cleared $40 a foot. Eastern Nassau went the other way, down 40 cents to $30.64. Class A space overall gained 40 cents to $37.61.

A ten-dollar spread between two submarkets in the same county, moving in opposite directions in the same three months, is not a market with one story. Proximity to the city line and to the housing that senior staff can actually afford to live near is being priced explicitly, and the tenants who need it are paying for it.

The two leases worth naming

Microchip Technology signed a new 73,500-square-foot lease at 878 Veterans Memorial Highway in Hauppauge. A semiconductor company committing to that much space in the middle of Suffolk's industrial spine is the more interesting of the quarter's deals, and it sits alongside the slow reinvention of the Hauppauge industrial park next door.

Grassi & Company renewed and expanded into 40,620 square feet at 50 Jericho Quadrangle. Renewals with expansions attached are the quietest good sign in commercial real estate: a firm that has been in a building, knows what it costs, and takes more of it.

Now the demolition

The quarter's largest transaction was not a lease. NYU Langone bought 1 and 2 Huntington Quadrangle in Melville for $135.5 million, or about $177 a square foot.

It is not moving in. The health system intends to demolish both buildings, 763,877 square feet of office space, and build a hospital on the site.

Hold that against the year-to-date occupancy gain of 359,529 square feet. One transaction is removing more than twice as much office space from Long Island's inventory as every tenant on the Island has absorbed all year. When those buildings come down, the vacancy rate will improve again, and not one additional person will have leased an office.

Melville is a fair place for this to happen. It was built as a corporate-headquarters submarket for a version of the American office that no longer employs as many people in as much space, and a 763,877-square-foot pair of Class B towers on a quadrangle is exactly the inventory that version left behind.

What the trend actually is

Cushman & Wakefield describes it plainly: Class B and C office properties on Long Island continue to be converted into mixed-use, multifamily, medical and industrial buildings.

That is the real market. Not a recovery in office demand, but a long, unglamorous reallocation, in which the weakest third of the Island's office stock stops being office. Medical is taking the best of it, because health care is the sector with both the demand and the capital. Multifamily is taking some, which happens to be the same conversion that state downtown money is trying to encourage for entirely separate reasons.

None of which makes 11.8 percent a bad number. A market where the surviving buildings are full, sublease space has drained away, and the best submarket can ask $40 a foot is a healthier market than the one Long Island had three years ago. It is just worth knowing that some of the healing is subtraction, and that the vacancy rate will keep improving for a while on the strength of the wrecking ball alone.