I think the last startup I worked for in London had the monthly rent peak at half or 1/3rd of the gross salaries when they reached 25 people. That's when they

I think the last startup I worked for in London had the monthly rent peak at half or 1/3rd of the gross salaries when they reached 25 people. That's when they moved to a high quality office in a prime location on a rooftop. With a lot of free space, to accommodate hiring 1 person per week for the next year.