nice house! dh and i inherited our house and would like to bring it back into better shape. ours was built per city records in 1902 but my dh says he thought he saw a stone with an older date somewhere around the foundation. we're not in anything historical other than it used to be owned by a church as a Parrish house and a pastor & his family used to own it before my FIL bought it in 1977.
right now i've been working on bringing back the fruit trees and garden on the property and working on the inside to make it livable again. my FIL left it in a deplorable state when he passed.
something i noticed you mentioned on your site was about the granite stones holding up the carriage house. those notches in the stone are from where the stone mason made his cuts to split the stone. they would start a hole every so many inches and use a method called 'plug & feather' to split the stone along a line.
http://en.wikipedia.org/wiki/Plug_and_feather