45 CFR §1303.48

1. (a)A grant recipient cannot mortgage, use as collateral for a credit line or for other loan obligations, or, sell or transfer to another party, a facility, real property, or a modular unit it has purchased, constructed or renovated with Head Start funds, without the responsible HHS official's written permission.
2. (b)A grant recipient must have the responsible HHS official's written permission before it can use real property, a facility, or a modular unit subject to federal interest for a purpose other than that for which the grant recipient's application was approved.