Sorry to hear of another business being pushed into closing or relocating. I will visit Rosie Lees when next in London.
It resonated with me what John (Annv) posted. When we rented our office, the landlord, who was really a very good landlord, suggested a rent increase. My argument went along the lines of if you have a mortgage on the property, rates are at an all time low, and if you own the building outright then you’ve had no increase in costs. We eventually agreed an increase of about half the suggested one to cover other “administrative “ costs.