I have an old small building-1890's that was "according to the owner" used for commercial purposes intil around 1980-85. The building was then used for residential purposes(not sure if a single family or multiple units). The unit was relocated to a new site with a residential permit on a new foundation and now he wants to go back to use it for commercial use(a bank). Would you require him to provide a structual analysis of the building since it's a change of use or would you say its just going back to its original use. If it was a newer building I wouldnt be overly concerned with the structual design but with this being a building constructed back in the late 1800's I have some reservation about the whole thing. What are your thoughts?