1. Short title This Act may be cited as the Disaster Opportunity Zones Act . 2. Additional designations of opportunity zones Section 1400Z–1 of the Internal Revenue Code of 1986 is amended by adding at the end the following new subsection: (g) Additional designations for certain disaster areas (1) In general Notwithstanding subsection (d), an eligible population census tract may be designated as a qualified opportunity zone. (2) Process for designation An eligible population census tract shall be designated as a qualified opportunity zone in the same manner as described in subsection (b), except that for purposes of applying such subsection to eligible population census tracts, the determination period shall be the 90-day period beginning on the date of the enactment of this subsection (as extended under subsection (b)(2)). (3) Limitation The number of eligible population census tracts that may be designated under this subsection may not exceed the greater of— (A) 25 percent of the eligible population census tracts in the State, or (B) 25. (4) Special rules In applying this subchapter to any qualified opportunity zone designated under this subsection, for purposes of determining— (A) whether any property which would not be qualified opportunity fund business property without regard to this subsection is qualified opportunity fund business property, and (B) whether any corporation or partnership which is not a qualified opportunity fund business without regard to this subsection is a qualified opportunity fund business, subparagraphs (B)(i)(I), (C)(i), and (D)(i)(I) of section 1400Z–2(d)(2) shall each be applied by substituting the incident beginning date of the disaster described in section 1400Z–1(g)(5)(B) with respect to such qualified opportunity zone for December 31, 2017 . (5) Eligible population census tract For purposes of this subsection— (A) In general The term eligible population census tract means a population census tract which— (i) is a low-income community, and (ii) is part of a qualified disaster