Although there are no set rules on levels of a rent deposit, the amount will generally be a multiple of the monthly rent, reflecting market conditions (ie taking into consideration the amount of time it could take to find a replacement tenant). In practice, rent deposits will normally be between 3 and 6 months' worth of rent.
The exact rent deposit amount is generally negotiated between the landlord and the commercial tenants. Factors that may be considered in setting a deposit level include:
the commercial tenant’s creditworthiness
the length of the commercial lease
the type of commercial property