The spine of tall buildings continues west nearly reaching the Schuylkill with this pair of gray granite–clad towers with a shared lobby and winter garden. The firm's staid towers are crowned by signature granite squares standing on their corners on the narrow facades. Still farther west is Harbeson, Hough, Livingston and Larson's Miesian-minimalist black tower of 1970 for the Philadelphia Electric Company's offices at 2301 Market Street that borders the Schuylkill. Its nighttime image, a crowning electronic message board converted to a LED display, is the city's most visible reference to the media age.