Some landlords have mortgages to pay too - so in that case "rent holiday" is basically "landlord pays for tenant". But commercial real estate seems to be a different beast. I've witnessed a large amount of commercial property being empty for years at a time (5+) in a fairly expensive area of NY. Commercial landlords in this case probably owned the buildings outright and were in agreement to keep rents high even if it made it longer to find the next tenant. It probably is not like that everywhere, but I was really surprised that half of the building would just sit unoccupied for so long.