Again, KDOT is only coming up with general routing Ideas. The exact routing can easily be made to avoid historical landmarks and the like. If push comes to shove, it is also possible to move the house without destroying it.
An additional comment I have received (which may sound a little blasé) is that not all old buildings are worth saving.
Farm severeness are going to happen whenever a highway is built in an agricultural area. The Farmer (or whomever has land being taken for a highway) is required just compensation by the Bill of Rights. We could wind up with two split farms with the 4 parcels switched