There are a few different ways to calculate the replacement cost of a commercial building. The most common method is to use the square footage of the building and multiply it by the average cost per square foot for commercial construction in the area. This will give you a general idea of what it would cost to replace the building.
Another way to calculate replacement costs is to use an online calculator or software program that specializes in estimating commercial construction costs. These programs take into account many different factors, such as local labor and materials costs, type of construction, and more. This can be a more accurate way to estimate replacement costs, but it will likely be more expensive than simply using square footage alone.
If you're not sure how much it would cost to replace your commercial building, it's always best to consult with a professional contractor or estimator. They will be able to give you a more accurate estimate based on their experience and knowledge of local construction costs.