It's nice to get those kind of accounts but if ever new guy in the business went straight to the theaters, restaurants and such, and they were willing to give very low prices just to get the job, it would be bad for the industry and the commercial accounts.
Just kidding, every new guy in the business goes after those accounts and most try to lowball the price just to steal it from someone else. What happens is the commercial accounts get used to extreme low prices and very bad cleaning. Then the commercial accounts will look for the next cleaner to do a better job but at that same very low price.
Oh by the way, the new cleaners with the extreme low price don't usually last in the business because of extreme low pricing. They don't understand what profit margin is.
There is a lot of things you can learn here using the search feature and in the right section
Good luck