Section 50.20 - Categorical exclusions subject to the Federal laws and authorities cited in Section 50.4(a) The following actions, activities, and programs are categorically excluded from the NEPA requirements for further review in an Environmental Assessment or an Environmental Impact Statement as set forth in this part. They are not excluded from individual compliance requirements of other environmental statutes, Executive orders, and HUD standards cited in § 50.4 , where appropriate. Where the responsible official determines that any proposed action identified below may have an environmental effect because of extraordinary circumstances (40 CFR 1508.4 ), the requirements for further review under NEPA shall apply (see paragraph (b) of this section). (1) Special projects directed to the removal of material and architectural barriers that restrict the mobility of and accessibility to elderly and persons with disabilities.(2) Rehabilitation of buildings and improvements when the following conditions are met: (i) In the case of a building for residential use (with one to four units), the density is not increased beyond four units and the land use is not changed;(ii) In the case of multifamily residential buildings:(A) Unit density is not changed more than 20 percent;(B) The project does not involve changes in land use from residential to non-residential; and(C) The estimated cost of rehabilitation is less than 75 percent of the total estimated cost of replacement after rehabilitation.(iii) In the case of non-residential structures, including commercial, industrial, and public buildings: (A) The facilities and improvements are in place and will not be changed in size nor capacity by more than 20 percent; and(B) The activity does not involve a change in land use, such as from non-residential to residential, commercial to industrial, or from one industrial use to another.(3)(i) An individual action on up to four dwelling units where there is a maximum of four units on any one site. The units can be four one-unit buildings or one four-unit building or any combination in between; or(ii) An individual action on a project of five or more housing units developed on scattered sites when the sites are more than 2,000 feet apart and there are not more than four housing units on any one site.(iii) Paragraphs (a)(3)(i) and (ii) of this section do not apply to rehabilitation of a building for residential use (with one to four units) (see paragraph (a)(2)(i) of this section).(4) Acquisition (including leasing) or disposition of, or equity loans on an existing structure, or acquisition (including leasing) of vacant land provided that the structure or land acquired, financed, or disposed of will be retained for the same use.(5) Purchased or refinanced housing and medical facilities under section 223(f) of the National Housing Act (12 U.S.C. 1715n ).(6) Mortgage prepayments or plans of action (including incentives) under 24 CFR part 248.(b) For categorical exclusions having the potential for significant impact because of extraordinary circumstances, HUD must prepare an EA in accordance with subpart E. If it is evident without preparing an EA that an EIS is required pursuant to § 50.42 , HUD should proceed directly to the preparation of an EIS in accordance with subpart F.61 FR 50916, Sept. 27, 1996, as amended at 68 FR 56127 , Sept. 29, 2003; 79 FR 49229 , Aug. 20, 2014