For a traditional office lease the cost of office space is calculated based on the price per square meter and multiplied by the size of the space to give a net annual rent. For a 1500 sq. ft. unit with a $65 sq. ft net rent in the city, the monthly rent for an office comes out to $8,125 per month (1500 x $65 / 12 months), on top of which are outgoings for building management, electricity, Internet, etc, which are not always fixed. Additionally, you will pay to fit-out and furnish the office - which may or may not be paid from incentives. And then there is the Bank Guarantee which can be as high as six months.
For flexible office space, the calculation is more straightforward and based on the number of desks your business needs. If for example, each desk in a private office costs $650 per person, the cost for a 10 person office is simply $6,500 ($650 x 10 = $6,500 per month). Flexible office rental typically includes credits towards meeting rooms, printing facilities, but for heavy users of either, there are options to have these services included. For the Security Deposit, typically one or two months is all that is required.