Restoring old architecture is expensive to do properly. You have to use tradesmen that are very qualified in areas of construction that very difficult to find. Lumber sizes were different in the old days and methods of construction/materials were quite different. Special millwork, stonework, plastering and paint colors are all part of the authenticity. If you want to preserve it properly and accurately, it takes a lot of money, time and special knowledge. The faint of wallet do not qualify.
If you want to see a joke of restoration in a Historic District, simply visit Ol' Southport. All of their authentication plaques are secured to vinyl siding adjacent to the vinyl doors. Just about as "authentic" as a Kia in a vintage antique ar show.
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