Metropolitan Fire Department Headquarters - Firemen's Hall - 155 Mercer Street  Lower Manhattan 
     - firehouse built 1856 was first headquarters of the new paid Metropolitan Fire Department (later named FDNY).
1856:
1868:
     Note: - Harpers Weekly 1865 sheet celebrating new paid fire department - Metropolitan Fire Department
              - 155 Mercer Street firehouse upper left in picture.
              - Statue at top of firehouse is Harry Howard, Chief Engineer of the Volunteer Department,
1881:
Note:  FDNY Headquarters moved 1887 to 157 East 67th Street which was also quarters for Engine 39 and Ladder 16.
155 Mercer Street quarters for Engine 13, Ladder 20, Battalion 3:
155 Mercer Street Firemen's Hall firehouse was quarters for:
     Ladder 20 organized 155 Mercer Street                                            1889
     Ladder 20 moved 163 Mercer Street                                                1893
     Ladder 20 moved 120 Mercer Street                                                1894
     Ladder 20 new firehouse 251 Lafayette Street w/Engine 13               1974
     Ladder 20-2 organized 155 Mercer Street                                        1889      
     Ladder 20-2 disbanded                                                                   1895
     Ladder 20-2 reorganized 155 Mercer Street                                      1895
     Ladder 20-2 disbanded                                                                   1939
     Engine 13 located at 155 Mercer Street                                        1948-1974
     Battalion 3 located at 155 Mercer Street 1894-1903, 1904, 1905-1913, 1922-1956
     Battalion 5 located 155 Mercer Street 1903-1904, 1959-1974
155 Mercer Street former FDNY Headquarters and former firehouse - current use: