Salesforce also currently owns, and used to occupy 50 Fremont St as well, aka Salesforce West. Previously it occupied 400,000 sq ft of it before putting it up for lease in order to cut office space.
In the pre-pandemic times, Salesforce used to occupy the 3 main buildings you see on the left half of this photo I took (counterclockwise from the top Salesforce Tower, Salesforce West, Salesforce East). The one on the right is 181 Fremont, previously occupied by the Instagram division of Meta. It's now partially leased by Zendesk, and possibly soon, ByteDance aka TikTok. The tower on the bottom right is the infamous Millennium Tower.
PC: homebucket