In 1983, the city sold the land, but included a covenant in the lease that required the buyer, Biotech Inc., to care for the old horses for as long as the city maintained mounted patrols, plus 10 years.
In return, the company could draw horses' blood for biological products. The company took blood samples from them for their research. The company planned to develop a synthetic blood substitute, But their research did not pan out and the company folded a few years ago.
I don’t know if there are any plans for the former BioTech Inc. laboratory, but as of right now, it’s still sitting vacant.