Complex sentence: Before the current building was erected, the site was location of the 6 story Butler Exchange building (located at 55 Exchange Place) constructed in 1872, on land purportedly deeded by the heirs of the original Samuel Butler.
Split into simpler sentences: Before the current building was erected, the site was location of the 6 story Butler Exchange building. Located at 55 Exchange Place and constructed in 1872, the land was purportedly deeded by the heirs of the original Samuel Butler.