Section 19-135. Projections prohibited

It shall be unlawful to build, erect
  or make areas, steps or other projections  (except  those  indicated  in
  subdivisions  a, b, c, d and f of section 27-313 of the code) beyond the
  building line, upon the following streets:
    1. Grand Boulevard and Concourse, in the borough of The Bronx, between
  East One hundred sixty-first street and Mosholu Parkway.
    Exception. In that  section  of  the  Grand  Boulevard  and  Concourse
  located within a business use district, areas (meaning open spaces below
  the  ground  level  immediately outside of the structure and enclosed by
  substantial  walls)  may  project  beyond  the  building  line  at  most
  one-fifteenth  of  the  width  of  the street or a maximum of five feet,
  provided that every such area is covered over at the street level by  an
  approved  grating of metal or other incombustible material of sufficient
  strength to carry safely the pedestrian street traffic.
    2. Newkirk avenue, between Flatbush avenue and Coney Island avenue, in
  the borough of Brooklyn, and on all streets in the borough  of  Brooklyn
  where projections are prohibited by law.