Section 811.101 - Purpose and scope(a) The purpose of this part is to provide a basis for determining tax exemption of obligations issued by public housing agencies pursuant to Section 11(b) of the United States Housing Act of 1937 (42 U.S.C. 1437i ) to refund bonds for Section 8 new construction or substantial rehabilitation projects.(b) This part does not apply to tax exemption pursuant to Section 11(b) for low-income housing projects developed pursuant to 24 CFR parts 950 and 941.61 FR 14460, Apr. 1, 1996