nonprofit corporation. (6) Manufactured home The term manufactured home means a structure, transportable in one or more sections, which— (A) in the traveling mode, is 8 body feet or more in width and 40 body feet or more in length, or when erected on site, is 320 square feet or more, (B) is built on a permanent chassis and designed to be used as a dwelling (with or without a permanent foundation when connected to required utilities) and includes plumbing, heating, and electrical heating systems, and (C) in the case of a structure manufactured after June 15, 1976, is certified as meeting the Manufactured Home Construction and Safety Standards issued under the National Manufactured Housing Construction and Safety Standards Act of 1974 ( 42 U.S.C. 5401–5426 ) by the Department of Housing and Urban Development and displays a label of such certification on the exterior of each transportable section. (c) Special rules (1) Related person For purposes of subsection (b)(2)(A), a person (hereafter in this subparagraph referred to as the related person ) is related to the seller if— (A) the related person bears a relationship to the seller specified in section 267(b) or 707(b)(1), or (B) the related person and the seller are engaged in trades or businesses under common control (within the meaning of subsections (a) and (b) of section 52). (2) Election by both seller and buyer The credit is allowable under this section only if— (A) elected by both the seller and the buyer of the real property and evidenced by an affidavit executed by both parties, and (B) the buyer of the real property records the affidavit and the affidavit is referenced in its deed to the real property. The seller shall elect the credit under this section on its return of tax. (d) Tax upon violation of covenant There is imposed a tax on the buyer for a violation of the covenant specified in subsection (b)(2)(B). The amount of such tax shall be 20 percent of the net proceeds after settlement for the sale or exchange of the real property referred to in