How much of London is owned by Qatar’s royal family?

How much of London is owned by Qatar’s royal family? 

Qatar’s royals are adding a massive £200m-plus Regent’s Park palace to their multiple investments in the capital. So apart from Harrods, what else have they acquired in their ongong spending spree?
It will by all accounts be one hell of a gaff: a Grade I listed, 13-bedroom, 30,000 sq ft, twin-lift mansion on Regent’s Park, complete with spa, heated swimming pool, gymnasium, beauty salon, powder rooms, a children’s floor, games rooms, wine cellar, fumoir and staff wing.