Building cost & build out cost, can the be combined?

[Adam Rees]

I own a small business. We are thinking of changing locations and buying the new space rather than renting. 

Space cost is listed at $375k. I'm estimating build out at $125k. 

Does anyone know if it's possible (or even common) to have both loans under the mortgage? Instead of a $375k mortgage and a $125k business loan.