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Gardner Tanenbaum acquires Landmark Towers portfolio for $16.25 million

Buyer plans to convert three dated Oklahoma City office buildings into multifamily housing
Buyer Gardner Tanenbaum Holdings plans to convert the three office towers in the Landmark Towers portfolio into apartments, marking a large‑scale adaptive‑reuse project for the Oklahoma City market. (CoStar)
Buyer Gardner Tanenbaum Holdings plans to convert the three office towers in the Landmark Towers portfolio into apartments, marking a large‑scale adaptive‑reuse project for the Oklahoma City market. (CoStar)
By Jillian Harris
CoStar Research
February 12, 2026 | 9:24 P.M.

https://product.costar.com/professionals/contacts/detail/90lhpj4/summaryA prominent office complex in northwest Oklahoma City has traded in a deal that sets the stage for a significant office-to-residential conversion along one of the city’s prominent corridors.

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News | Gardner Tanenbaum acquires Landmark Towers portfolio for $16.25 million