How long is a piece of string?
Rates are lower in the "Rust Belt" where jobs are shrinking.
Rates are higher for upscale buildings with amenities.
Rates are dependent upon the use of the property to some extent. Different commercial uses have different space requirements.
There is one web site I can recommend if you want to get an independent idea of what commercial space leases for, for a variety of uses, in a variety of states. You enter your parameters and an estimate is provided.
But, let's be realistic - when you actually try to lease commercial space, it will be represented by a broker, someone like my lifelong friend who owns Wolf Commercial Real Estate out here in California. There is going to be a lease commission paid by the owner of the space.
Once you have reviewed the VERRRY APPROXIMATE lease rates you can find, either from this web site or anecdotally, it is inevitable that you will be dealing with a commercial broker. It will cost you NOTHING ADDITIONAL to ensure that there is a commercial broker representive YOU and YOUR NEEDS exclusively... which is why I recommend you enlist professional help now to define the size and type of commercial space you need, where you need it, when you need it, ... and then let them find candidate space for your review.
Here is the web site that promises representative prices for commercial space. I have found commercial space myself during my prior business career, I can tell you that if you find the right special situation it can make a 50% difference in your lease rate.