Most of them are not. The reality is, workers in the US are more or less equally split between big businesses and small-to-medium businesses, and outside of the States it skews much more toward small-to-medium. These are companies that often have less than amicable relationships with their landlords, because landlords have this nasty tendency of acting like landlords.
On top of that, much commercial real estate is owned by REITs, which are managed from the biggest cities, and aren't really entities small and medium businesses get to have real relationships with, any more than an apartment renter gets to have a relationship with their residential REIT.
They're not buddies. They don't even have a direct line of contact.