Throughout 2020, the prevailing sentiment among investors in the San Francisco office market was one of relative optimism.  After all, despite the fact tenants were prohibited from occupying their buildings, they continued to collect full rent.  The buildings were full, with vacancy hovering around 4%.  Sure, companies weren’t happy about paying for space they couldn’t use, but business was good.  In many cases the tech sector (which makes up most of San Francisco’s office occupancy) was booming due to an even greater reliance on and usage of tech caused by pandemic driven changes in how people were living.  Throughout the course of 2020 there was no reason for San Francisco investors to panic, as few (if any) office occupiers were showing signs of developing long-term hybrid or remote-first strategies.  Most were simply focused on solving for ongoing operations as a temporary reaction to the pandemic.  Yet early indicators did point to a future in which companies would be shedding office space, as some expiring leases were not replaced.  This, coupled with the addition of new supply, caused a big increase in vacancy to nearly 12% by year end.  Despite this large uptick, the brunt of the sluggish demand dynamic was being felt in the sublease markets, where rental economics more accurately reflected the true state of the market.  Despite a total closing of the office market in 2020, average asking rents ended the year off just 6% from the pre-pandemic high.