Could you explain what you mean about the incentives from tax and accounting policy? Are you saying that tax benefits for having office space are richer than the actual expense of renting that office space?
Essentially, there seem to be significant tax, accounting, and general financial incentives associated with office space and expenditures that come with it. Take, for example, during the recession, special corporate tax rules were set in place that rewarded and essentially subsidized capital expenditures and allowed for accelerated write-downs.
Those are not necessarily solely financial incentives, but they function to compound and combine with already established systems of corporate organization, personnel structures, and general status quo operations and processes. In that scenario, the co-located work paradigm was not only supported and strengthened where remote working was not, but it also set an expectation that thar be government breast milk in tumultuous times.
I am no corporate tax, accounting, or financial expert; but what I can say is that it seems to be the forest that can't be seen for all the trees.
In the USA, you can deduct your business expenses (including building rental) from your profits for tax purposes. This creates a huge incentive to rent, as it's basically free - the company is basically paying part of their tax payment to their landlord.