The footprint of the building when viewed in plan resembles the shape of the letter L; that is, the building is a single unit (no seismic gap) with two ‘wings’ near to or at right angles to each other.

PLFL_USA_Brzev&Googleearth_1

This building in San Francisco, California has a L-shaped plan (Left: S. Brzev; right: Map data ©2013 Google, DigitalGlobe, U.S. Geological Survey)