The Secretary of the Treasury is authorized and directed from time to time to credit and cancel the note or notes of the Housing and Home Finance Administrator executed and delivered in connection with loans transferred from the Reconstruction Finance Corporation to the Housing and Home Finance Agency pursuant to Reorganization Plan Numbered 23 of 1950 (64 Stat. 1279), to the extent of the net loss, as determined by the Secretary of the Treasury, sustained by said Agency in the liquidation of defaulted loans. The net loss shall be the sum of the unpaid principal and advances for care and preservation of collateral, together with accrued and unpaid interest on said principal and advances, and all expenses and costs (other than those subject to administrative expense limitations) in connection with the liquidation of defaulted loans, less the amount actually realized by the Housing and Home Finance Agency on account of such defaulted loans.