Section 1804. Acquisitions of real property

No  purchase,  lease,
  condemnation or other acquisition of real  property  by  the  department
  shall  be  authorized  until  (1)  a  public  hearing has been held with
  respect to the acquisition after the publishing of notice  in  the  City
  Record  at  least  thirty  days  in  advance of such hearing and (2) the
  department shall have received the  approval  of  the  mayor;  provided,
  however, that in the case of an acquisition by purchase or condemnation,
  no  such  hearing  shall  be  required  if a public hearing is held with
  respect  to  such  purchase  or  condemnation  pursuant  to  any   other
  requirement  of  law.  In the case of a lease in which the city is to be
  the tenant, the notice for the  hearing  required  in  this  subdivision
  shall  include  a  statement  of  the  location  and proposed use of the
  premises, and the term and annual rent of the proposed lease.