Same boat here
Being that we have a flat roof, resulted in a 30K outlay 2 years ago for new rubber and installation...
Last year 10K in electrical, mostly to add plugs where there were none, and go form 30 breakers to over 100 to aleviate the cobble job that resulted in years of adding things here and there...
Cool thing, is our building is the first (only?) retail building designed by Alden B Dow AIA, and will be going on the National Register next year.