Section 209. Determination of development cost

1. Upon the completion of a
  development a redevelopment corporation shall, or upon the completion of
  a principal part of a development a redevelopment corporation may,  file
  with the supervising agency an audited statement of the development cost
  thereof.  Within  a  reasonable time after the filing of such statement,
  the supervising agency shall determine the development  cost  applicable
  to  the  development  or  such  portion  thereof  and shall issue to the
  redevelopment corporation a certificate stating the amount thereof as so
  determined.
    2. A redevelopment corporation may, at  any  time,  whether  prior  or
  subsequent  to  the undertaking of any contract or expense, apply to the
  supervising agency for a ruling as to whether  any  particular  item  of
  cost therein may be included in development cost when finally determined
  by  the  supervising  agency,  and  the  amount thereof. The supervising
  agency shall, within a reasonable time after such application, render  a
  ruling thereon, and in the event that it shall be ruled that any item of
  cost  may  be  included  in  development  cost, the amount thereof as so
  determined shall  be  so  included  in  development  cost  when  finally
  determined.