(d) In any of the actions or proceedings specified in subdivision (a)
of this section and on the application of any party, any city department
or the court, on its own motion, may join any other person or city
department as a party in order to effectuate proper housing maintenance
standards and to promote the public interest. In addition to any other
application of its powers under this subdivision, the court may, on the
application of any party or on its own motion, join as a party the
department of social services of the city of New York in any action or
proceeding in which the payment or non-payment of rent by a recipient of
or applicant for public assistance pursuant to the social services law
is at issue, and the court may join as a party the division of adult
protective services of the city of New York in any such action or
proceeding, where appropriate.