All of the provisions of § 207.259 of this chapter relating to insurance benefits apply to multifamily project mortgages insured under this subpart, except as provided in this section:

(a) [Reserved]

(b) Below market interest rate mortgages. Where the mortgage has been finally endorsed and the special below market interest rate provided in § 221.518(b) is applicable as of the date of default, the 1 percent deduction from insurance benefits prescribed in § 207.259(b)(2)(iv) of this chapter shall not be applicable.

(c) Mortgages financed with section 11(b) obligations. Where the funds for a mortgage loan are provided by obligations that are tax-exempt under section 11(b) of the United States Housing Act of 1937 (24 CFR part 811), the one percent deduction from insurance benefits prescribed in § 207.259(b)(2)(iv) of this chapter shall not be applicable to claims with respect to multifamily rental housing projects for which a firm commitment for mortgage insurance was issued on or after March 12, 1979.