**Sigma Computing Joins Tenant Roster at SL Green’s One Madison Avenue**
SL Green Realty Corp. has announced a new lease agreement with Sigma Computing, Inc. for 64,077 square feet of office space on the third floor of One Madison Avenue. With this addition, the building is now 78.1% leased.
So far in 2025, SL Green has secured office leases in Manhattan totaling over 1.26 million square feet, and currently maintains a leasing pipeline of approximately 1 million square feet.
“We’re excited to welcome Sigma Computing to One Madison Avenue, where they join a sterling tenant roster that includes IBM, Franklin Templeton, Coinbase, Flutter Entertainment, and Palo Alto Networks,” said Steven Durels, Executive Vice President and Director of Leasing and Real Property at SL Green. “Midtown South leasing momentum has accelerated, and we are encouraged by advanced discussions covering a significant portion of the remaining available space at the property.”
Brent Ozarowski of Newmark represented Sigma Computing in the lease transaction. The landlord was represented by Paul Glickman, Alex Chudnoff, Ben Bass, and Diana Biasotti of JLL.
