The Tower Building, 50 Broadway, 1927.

Sometimes cited as the city's first skyscraper, due to its innovative steel-frame design, architect Bradford Gilbert's Tower Building was completed in 1889. Gilbert had to design the set structure to meet the need for a building to rise higher than the usual five or six stories and to take advantage of a small 25-foot wide plot. The first seven stories were supported by cast-iron columns encased within brick walls and linked across the width of the building by wrought-iron girders. Above this structure were solid masonry-bearing walls resting atop the seven story iron framework. The building lasted just 25 years, and was demolished in 1913 after a foreclosure and difficulty attracting tenants.