ยง  121.  Sinking  fund. Unless other provision be made therefor in the
  contract with the municipality, the supervising agency, if it shall deem
  it feasible at any time, subject to the limitation contained in  section
  one  hundred  seven of this article, may require a redevelopment company
  to provide out  of  earnings,  after  provision  for  distributions  and
  interest,  a  sinking  fund in an amount to be fixed by such supervising
  agency for the gradual retirement of the capital  and  income  debenture
  certificates  of  such company. Such sinking fund may be used either for
  the purchase or retirement, from time to  time,  of  capital  or  income
  debenture certificates at a price approved by the supervising agency not
  exceeding  par  value  thereof  with accrued and unpaid distributions or
  interest, or if it be not practicable to purchase or retire such capital
  or such income debenture certificates at a price so approved, the moneys
  in such sinking fund may be added to the surplus of  such  company.  Any
  capital  evidenced  by shares or income debenture certificates purchased
  or retired out of such sinking fund shall be cancelled and shall not  be
  reissued.
Structure New York Laws
Article 5 - Redevelopment Companies
101 - Policy of State and Purpose of Act.
103 - Redevelopment Companies; How Created.
104 - Consent of Supervising Agency to Creation of Redevelopment Companies.
105 - Application of Other Corporation Laws.
105-A - Application of Other Laws.
106 - Powers of Redevelopment Companies.
107 - Limited Return on Investment.
108 - Consideration for Capital and Bonds.
109 - Minimum Amount of Capital and Debentures.
111 - Mortgages and Mortgage Bonds.
111-A - Participation by Certain Corporations and Individuals.
114 - Procedure for Submission and Approval of Plan or Project.
116 - Transfer of Real Property to Redevelopment Company.
120 - Regulation of Redevelopment Companies.
120-A - State Supervision and Regulation.
122 - Transfer of Title or Foreclosure of Project.
124 - Participation by Certain Corporations.
126 - Reduced Rentals for the Elderly.