We have a 162 year old home in central MO that is on the National Historic Register. It is not huge but unique in that it has 13 ft 1 inch ceilings. It has a 28 inch limestone foundation so we've had no structural problems except a few joists that "had wandered from years of vibration". Rewiring, putting in a new junction panel and getting rid of some of the old aluminum wiring ran 7,500, but the biggest expense has been replacing the fuel oil boiler with a natural gas boiler. It ran about 12,000 and getting the fuel oil tank out of the basement was MAJOR! Now we do one inside and one outside project every year. We just love the history and wood work of the home. The entrance wallpaper is faded and torn BUT it;'s original from 1849 and my wife won't let me touch it - thank you for that dear!
All the pocket doors were original and the previous owner replaced some of the plaster with gypsum board, so we do one room a year back to the wood lathe and plaster. One major warning, if the tuck pointer wants to drill out the old limestone mortar to replace it - find another one, because he's never dealt with old limestone mortar and doesn't know what he's doing. This started out as a summer home and has become our year round home in retirement. Yes it's a little cold in the winter, but with 7 fireplaces, we always have a fire going and I wouln't touch the wavy leaded glass in the windows.