Section 822. Public buildings and facilities

With  respect  to public
  buildings and facilities, the  commissioner  shall  have  the  following
  powers and duties:
    (a)  to  manage, alter, repair, operate, maintain and clean buildings,
  facilities and offices leased or occupied for public use  by  more  than
  one   city  agency  whose  management,  alteration,  repair,  operation,
  maintenance or cleaning is paid for in whole or in part  from  the  city
  treasury,  and  as  directed  by the mayor, to perform services in space
  occupied for public use by a single city agency;
    (b) except for the provisions of chapter  nine  of  this  charter,  to
  employ,  when  in the commissioner's opinion such services are necessary
  or desirable, qualified consultants  in  private  practice  to  aid  the
  commissioner in carrying out his or her duties and responsibilities with
  respect  to  public buildings or facilities; such consulting or advisory
  services shall be performed under the supervision of the commissioner;
    (c) to exercise and perform such other powers and  duties  as  may  be
  prescribed  by  law or delegated to him or her in relation to laboratory
  testing of commodities and construction materials.
    Notwithstanding the provisions of this section, the  exercise  of  the
  powers  and duties set forth herein shall be subject to the jurisdiction
  of  any  city  agency  performing   urban   renewal   and   public   and
  publicly-aided  housing  functions  to the extent, and in such areas, as
  directed by the mayor.