The former Armitstead Child Development Centre in Broughty Ferry was sold for £642,000.
Six months after NHS Tayside sold the site, a report on property transactions presented to health chiefs revealed the proceeds of the sale.
The site was sold to H&H Properties, the same developers who bought the former Dundee Royal Infirmary site and created a mix of new-build housing and conversion of existing buildings to flats and town houses.
So far the company has not shared its intentions for the Monifieth Road site.
The property has lain vacant for almost three years since a purpose-built centre for the care of disabled children was opened at Kings Cross Hospital in Dundee and services transferred there.