On average, listings lease in the $0's per square foot per year. The Belgrade region is seeing a decline in rates. In the last 3 months, the median rate fell $17 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 0 listings have been made available, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. About NaN% of the office spaces in the Belgrade are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft.