300 Grant Ave 300 Grant Ave.’s Union Square location will be amid luxury brands of Dior, Valentino and Cartier.

SAN FRANCISCO—300 Grant Ave. in Union Square–an approximately 70,000-square-foot development project–began construction last month with plans for delivery in fall 2019 and opening in spring 2020. The ground-up development will consist of six floors, with retail on the first three floors and class-A creative office space on the upper level.