This paper examines vertical patterns of employment density and agglomeration economies within tall buildings. Theory suggests that vertical density should depend on the interplay of street access, heightrelated amenities, and productivity.

Based on suite level data, the authors show that density patterns are u-shaped, with high density at ground level and high floors. Furthermore, factors associated with productivity, including nearby employment and firm-specific characteristics, have positive effects on employment density. Vertical density patterns are consistent with productivity spillovers that are strongest on a company’s floor and attenuate rapidly with vertical distance. Similar evidence is obtained based on sales for law firms.