First of all you need to determine the market value of one square meter of the same square, rent. The total amount of rent is calculated by multiplying the number of meters checked on the price for 1 sq. m. Buying newspaper ads or visiting the sites of real estate agencies, look at average prices per square meter in objects located in the area of your premises and are similar in other characteristics (year built, condition, communication, etc.). This will be the price, from which you can then push off.
Once you have determined the average market price per square, you should calculate rents based on the availability or, on the contrary, the absence of certain factors, which, depending on the category of the premises will have different impacts on the final price. These factors include internal and external characteristics.
External factors:

• District of the city where premises is located

• Proximity to public transport

• Location relative to transport routes

• The number of storeys of the building and floor on which the premises is located

• Possibility of Parking and availability of access roads

• Neighborhood
Internal factors:

• Decoration

• The possibility of placing advertising signs

• The availability of communications, from phone and ending with the sewer

• More specifications for warehouse and retail space: height of the room dostupnye electrical power, lighting, and more.
In addition, before you calculate the rent finally approved by tenant, should define the utilities for the use of the premises. In practice, there are two approaches to this question, each of which has a right to exist. Utilities are either included in the rent and paid the owner of the premises, or added "top" to the amount of rent, and the responsibility for their payment rests with the tenant. If you are willing to make small concessions to include utilities in the rental amount, then it might make sense to raise the cost of one square meter. However, in this case, you also need to focus on the market numbers.