215.314.  Owner obtaining subsidy must agree to certain requirements including rental rates — certification of rent for each subsidy unit and qualification of tenants to be filed, when — tenant's right to petition for lower rent, when. — The Missouri housing development commission shall not make additional subsidies to a multifamily rental housing project unless the owner enters into such agreements with the state or local government agency as are necessary to assure that:

  (1)  The housing will be retained as housing affordable for low income families or persons, and moderate income families or persons for the remaining term of the mortgage or until the term of any subsidy contract expires or an additional twenty years, whichever is longer, and throughout such extended period, adequate expenditures shall be made for maintenance and operation of the housing;

  (2)  The owner shall not charge or attempt to charge rents in excess of those deemed affordable to low income families for forty percent of those units becoming available to new tenants following vacation of a subsidized unit by previous tenants, and the owner shall not charge or attempt to charge rents in excess of those deemed affordable to moderate income families for the remaining sixty percent of the subsidized units becoming available following vacation by previous tenants;

  (3)  Following any vacation of a moderate or low income unit by its occupants the owner shall rent the unit to a household that qualifies as a low income household or moderate income household on its initial occupancy of the unit;

  (4)  The owner shall not increase rents on additional subsidy units more than one time every twelve months nor by more than a percentage amount equal to the percentage increase in the CPI for the preceding year unless the administering agency approves a greater increase due to extraordinary circumstances;

  (5)  The owner shall seek to retain, renew, extend and utilize, to the greatest extent feasible, any financing or subsidy arrangements available to the project which would expand the affordability of the housing;

  (6)  The owner shall not refuse to accept housing vouchers and section 8 existing housing certificates from tenants in partial payment of rent due;

  (7)  The owner shall not discriminate against any household desiring to rent a subsidized unit on the basis of the household's receipt of any public assistance payments or utilization of housing vouchers or section 8 existing housing certificates;

  (8)  Each year following grant of the additional subsidies, no later than sixty days following the anniversary date of the first grant of additional subsidies, the owner of the multifamily rental housing project shall submit a written certification to the administering agency on a form provided by the administering agency which set forth the rent of each additional subsidy unit held by the owner as of the date of the certification and which certifies to the administering agency that the occupants of each additional subsidy unit qualified as a low income household or moderate income household on the date of initial occupancy of the additional subsidy unit by that household;

  (9)  Any tenant residing in a multifamily rental housing project receiving additional subsidies may petition the administering agency for a downward adjustment of rent, if the tenant is paying rent in excess of thirty percent of his^* income.