Blacksmith Software and Sona Tech Sign NYC Leases
Two technology firms secure new office space at the 245 Fifth Avenue building in Manhattan.
Updated on Oct. 28, 2026 in Remote Work
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Blacksmith Software and Sona Technologies have signed new office leases at 245 Fifth Avenue in New York City. The leases add to the recent activity at the property owned by The Moinian Group.
Why it matters
The new leases represent a continuation of corporate leasing activity in the Midtown South neighborhood. These transactions follow a larger 55,000-square-foot lease signed by WeWork at the same address in August 2025.
Blacksmith Software and Sona Technologies leased 14,000 and 12,000 square feet respectively at 245 Fifth Avenue. These figures complement a 14,000-square-foot renewal by the Institute of Integrative Nutrition recorded in March 2025.
The players
The Moinian Group
This is a prominent New York City-based real estate development and investment firm that owns the property at 245 Fifth Avenue.
Blacksmith Software
The company is a software firm that has secured 14,000 square feet of office space on the seventh floor of the Manhattan building.
Sona Technologies
This technology company has leased 12,000 square feet on the 19th floor of the office building.
WeWork
This is a major provider of flexible workspace solutions that previously signed a large lease at the 245 Fifth Avenue site.
Newmark
The company is a commercial real estate services firm that represented the landlord, The Moinian Group, in these leasing transactions.
The details
Newmark represented the building owner, The Moinian Group, during the negotiations. Tandem Space acted for Blacksmith Software, while Cornelia Street Partners represented Sona Technologies.
Timeline
In March 2025, the Institute of Integrative Nutrition signed a 14,000-square-foot renewal.
In August 2025, WeWork signed a 55,000-square-foot lease at the building.
During Q3 2026, the Midtown South area recorded an average asking rent of $71.43 per square foot.
Market Landscape
The Midtown South Q3 2026 average asking rent of $71.43 establishes a valuation benchmark for office space in this sector of Manhattan. These new leases at 245 Fifth Avenue reflect the continued absorption of commercial space in the neighborhood relative to broader regional trends.
These leasing agreements signal a stable demand for office space within the Manhattan commercial market. For local professionals, the influx of technology firms may influence nearby service-sector demand and amenities near Madison Square Park.
The takeaway
The addition of new tech tenants to 245 Fifth Avenue demonstrates that major commercial buildings continue to attract diverse corporate occupants. Tenants should watch for how these office investments influence the ongoing revitalization of the Midtown South business corridor.
Further reading
For more on shifts in commercial office usage, visit the Remote Work section.
Source note: This article includes information reported by Commercial Observer.
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