"It must be the exact same footprint, height, width, etc" Are you sure about the height? I have a grand fathered ranch thats about half inside and half outside the 50 ft line. Its a relatively small lot so I am maxed out with impervious surface. I was under impression I could add a second floor over entire ranch as long as I stayed within height requirements (35 ft) and existing envelope. Can I only go up behind the line on the existing structure? That would be tough although maybe more theoretical question as I have been thinking of this forever and will never get to it.
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