64-613 - Special height regulations for buildings with non-conforming uses LAST AMENDED 5/12/2021 The maximum height of such altered, #enlarged#, relocated or reconstructed #building# with #non-conforming# #uses#, shall not exceed the maximum height permitted by the applicable district regulations, except that for #non-conforming# #residences# in C8 Districts or #Manufacturing Districts#, the maximum height of such altered, #enlarged#, relocated or reconstructed #building#, shall comply with one of the following options: (a) for #single# or #two-family residences#, a horizontal plane equivalent to a height of 35 feet, and for #buildings# other than #single-# or #two- family residences#, the applicable #sky exposure plane# for the district; or (b) for all #residences# a horizontal plane equivalent to the pre-existing height of such #building#, as measured from the top of the #lowest usable floor#, to the highest point of such pre-existing #building#, as measured from the #reference plane#.