His parents had to put up their home for the bond.
edit: i.e., it is far more likely to be a 25M home than a 250M home, because I've never heard of a 250M home.
Bond is actually whatever arrangement you make that the court accepts as surety in place of depositing the full bail amount as cash. Most commonly, this is paying a premium to a registered bond agent (who usually also does not pay the full bail up front), sometimes, its having other persons aa sureties who are liable for the bail if you don’t appear, or pledging other property as a guarantee, or, as in SBF's case, both, where his parents home is pledged and his parents are liable sureties.
“Put up” is not “give up”; it is to offer as collateral, that is, they got a loan secured by a lien on the home.