AT&T Corporate Headquarters Building

The former Sony Tower is the AT&T Corporate Headquarters Building, at 550 Madison Avenue, New York, NY 10022, in Midtown.

The AT&T Corporate Headquarters Building has about 685,000 square feet of floor area in total, including 636,000 square feet of office and 18,000 square feet of retail, according to NYC PLUTO 26v2. These are the city's estimates for the whole building, not space that is available.

The Landmarks Preservation Commission's building records date the AT&T Corporate Headquarters Building to 1978-1984, designed by Johnson/Burgee. The building is 37 floors tall.

Johnson/Burgee, according to the Landmarks Preservation Commission's building records, which list the style as Postmodern and its original use as an office building.

Yes. The Landmarks Preservation Commission designated the AT&T Corporate Headquarters Building an individual landmark on July 31, 2018 (LP-02600). Changes to a designated landmark, including many storefront, window and signage changes, need a permit from the Commission.

The AT&T Corporate Headquarters Building is at 550 Madison Avenue in Midtown, Manhattan. City records list 13-29 East 55th Street, 14-28 East 56th Street and 550-570 Madison Avenue on the same tax lot (BBL 1012910010). A space listed on Leasemark at any of these addresses shows up on this page.

550 Madison Avenue is in ZIP code 10022, according to the city's tax lot records (NYC PLUTO 26v2) and the Department of Finance's assessment roll. The AT&T Corporate Headquarters Building is at 550 Madison Avenue, New York, NY 10022, in Midtown.

The lot is in the C5-3 zoning district. PLUTO lists a built floor area ratio (FAR) of 18.62 and a maximum commercial FAR of 15 for this lot.

The closest subway station to the AT&T Corporate Headquarters Building is 5 Av/53 St (the E and F trains), about 650 feet away in a straight line, roughly 3 minutes on foot. Also nearby: 5 Av/59 St (the N, R and W trains), 5 min walk; 57 St (the M train), 5 min walk. Walking times are straight-line estimates; the street route is longer.

The NYC Department of Finance's 2026/27 assessment roll lists OAC 550 OWNER LLC as the owner of record of the AT&T Corporate Headquarters Building (BBL 1012910010). Big buildings are usually held through a company set up for that one property, so the name on the roll can differ from the landlord's brand or the managing agent. Deeds and mortgages for the lot are public in ACRIS, the city's property records system.

Leasemark does not have the building's tenant roster, but SEC filings name companies with offices at the AT&T Corporate Headquarters Building. One public company reports the address as its principal executive office: MSD INVESTMENT CORP.. 5 investment managers and funds file 13F holdings reports from the address, including Anomaly Capital Management, LP; Clayton, Dubilier & Rice, LLC; and Junto Capital Management LP. Private companies do not file with the SEC, so the full list of tenants is longer, and a company can also report a building it owns.

The AT&T Corporate Headquarters Building last sold in May 2016 for $1.4 billion, according to the deed recorded with the city. 550 MADISON FIFTH LLC and CLIPPER 550 MADISON OWNER LLC sold it to OAC 550 OWNER LLC. The deed is ACRIS document 2016053000110003 (BBL 1012910010) in the city's property records. A sale of the company that owns a building is not recorded as a deed, so it would not show there.

The AT&T Corporate Headquarters Building reported an ENERGY STAR score of 92 for calendar year 2024 in its Local Law 84 benchmarking filing. Under Local Law 33, as amended by Local Law 95 of 2019, a score of 85 or higher earns an A, 70 to 84 a B, 55 to 69 a C and under 55 a D, so 92 earns an A. The Department of Buildings assigns the grade a building posts, so the posted label can differ if a filing was corrected. Its site energy use came to 63.1 kBtu per square foot, less than half the national median of 142.6 for a similar property. Its greenhouse gas emissions were about 4,330 metric tons of CO2e (6.32 kg per square foot).

At its 2024 energy use, the AT&T Corporate Headquarters Building comes to about 3,151 metric tons of CO2e a year under Local Law 97's coefficients, against a limit of 5,193 tons for 2024 to 2029 (61% of the limit), so it would owe no penalty. From 2030 the limit drops to 1,844 tons and the same energy use counts as about 1,857 tons, about 13 tons over, or an estimated $3,500 a year unless the building cuts its emissions. This is an estimate from the owner's 2024 benchmarking filing using the coefficients and per-use limits in the law and the Department of Buildings rule, at $268 per ton over. It is not the building's Local Law 97 report, which can count credits and deductions this estimate cannot.

In the 12 months to October 2026, the Department of Buildings issued first permits for 24 jobs at the AT&T Corporate Headquarters Building. In the last two years, interior work was permitted on 11 floors (floors 1, 2, 17, 18, 27, 28 and 33 to 37, the cellar, the mezzanine and the sub-cellar). The newest build-out, on floor 27, was first permitted in June 2026 (mechanical, sprinklers; filed cost estimate $318,000). A sidewalk shed permit here is active until November 12, 2026. These are the Department of Buildings' DOB NOW work permits for tax lot 1012910010. A permit is approval to do the work; it does not say who the work is for or whether it is finished.

The Department of Finance's 2026/27 assessment roll lists a taxable value of $251.1 million for the AT&T Corporate Headquarters Building. At the Class 4 rate of 10.848% (tax year 2025/26, the latest rate the Department of Finance lists), that is about $27.2 million a year, roughly $39.76 per square foot of floor area, before abatements such as ICAP. The city's property tax records for BBL 1012910010 show the actual bill.

For tax year 2026/27, the NYC Department of Finance puts the market value of the AT&T Corporate Headquarters Building at $561.1 million ($63.3 million of it land) and its assessed value at $252.5 million, the 45% of market value the city assesses for Class 4 property. The city's market value rose 53% from 2022/23 ($366.8 million) to 2026/27.

No space at 550 Madison Avenue is listed on Leasemark right now. Nearby on Leasemark: office space for lease at 783 Madison 4th Floor in the Upper East Side (994 SF, $66.40/SF/yr). Owners and brokers can list space here for free, and tenants can post a requirement to be matched when space opens up.