A General housing assistance 111. Rental vouchers for the homeless (a) In general Section 8(o) of the United States Housing Act of 1937 ( 42 U.S.C. 1437f(o) ) is amended by adding at the end the following: (22) Rental vouchers for the homeless (A) Definitions In this paragraph: (i) At risk of homelessness The term at risk of homelessness has the meaning given the term in section 401(1) of the McKinney-Vento Homeless Assistance Act ( 42 U.S.C. 11360 ), except that 50 percent shall be substituted for 30 percent in subparagraph (A) of that section. (ii) Capacity-building period The term capacity-building period means the 2-year period beginning on the date on which the formula is established under subparagraph (E)(ii). (iii) Continuum of care The term continuum of care has the meaning given the term in section 578.3 of title 24, Code of Federal Regulations, or any successor regulation. (iv) Eligible public housing agency The term eligible public housing agency means a public housing agency that— (I) administers assistance under this subsection through a contract for annual contributions entered into with the Secretary