Also on another post it is claimed that there is a difference between a window cleaning round and a window cleaning business. (not related to you) Hence someone is wanting more for the work than the average going price for the areas.
As I wondered if you would sell at some point I was interested in the selling valuation or % per annum between a small business and a large or in your case a very large window cleaning business.
I see.
Well my opinion would be selling a round is selling a customer base. Selling a "business" would be the customer base plus all the assets of the company, vans, premises, equipment ect and it is then still run under the same name by someone else.
The general rule for selling any business is 3-5 times the anual profit plus the asset value. Sale price should not be based on turnover as it always seems to be in window cleaning.