Complex sentence: Part of the need for the tower is due to the recent downtown Cleveland residential uptick spearheaded by a 77% increase of new units and 95% occupancy rate from 2000 to 2015.
Split into simpler sentences: Part of the need for the tower is due to the two decade old resurgence of interest in downtown Cleveland. Residential population has upticked, spearheaded by a 77% increase of new housing units and 95% occupancy rate from 2000 to 2015.