Following a complex process revolving around a bankruptcy, Windmill Investments LLC closed on the six-building, 523,255-square-foot San Antonio office portfolio that once belonged to local real estate company Cotter & Sons. The portfolio includes:

• The 183,487-square-foot Alamo Towers at 901-909 N.E. Loop 410 — sales price was $13.1 million

• The 230,020-square-foot Petroleum Towers at 8626-8700 Tesoro Dr. — sales price was $15 million

• The 109,748-square-foot 1800 Plaza at 1800-1802 N.E. Loop 410 — sales price was undisclosed

Former Cotter & Sons’ president James Cotter died in January 2017 without a valid will. Additionally, as he’d personally guaranteed loans on the real estate he owned, the loans defaulted after his death. The entities that owned Alamo Towers and Petroleum Towers filed for bankruptcy in November 2017 and February 2018, respectively.

Carrie Caesar, Todd Mills and Hunter Mills with Cushman & Wakefield represented the seller. Robbie Casey of Robbie Casey Commercial Realty negotiated on behalf of Windmill Investments.

Pictured: 1800 Plaza

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