If you buy a car and don’t use it, you’re in much the same situation. You have an expensive thing gaining you no value. At worst that money could be in your savings. I imagine a company could find more productive uses for that capital. (A decent chunk of capital mind you, Google paid about 10% of its annual profit for a pair of offices in 2018.)
Sure, you could sell the car but you’re going to take a loss as office vacancy rates are at what I assume are historic highs (in Canada it’s about 17%).
The more conspiratorial minded may also point out that most CEO level folks or board members are pretty likely to have a lot of their wealth tied into the market, a not insubstantial sum of which is tied to corporate real estate. A significant disruption there could cost those folks and their friends heavily. It’s a little conspiracy minded for me but also not so much so that it feels ludicrous.