You can simply change any of the text that refers to square footage to square meters. As an example, if it says $/RSF, you could change to €/RSM. You can also change any of the cells with currency formatting by doing the following:
Go to Home> in the Numbers section, in the bottom right, click on the box with the arrow pointing to the bottom right > click on Currency > in the symbol section, click the drop-down and select the Euro symbol.