These photos showing 17th century architectural detail are of Preuilly's 'second chateau'. La Rallière was built by Samuel Gaudon (hence the SG monogram in the cornice). It is to my mind a much grander building that Preuilly's chateau proper, but strictly speaking it is a hôtel particulier (grand town house).
Gaudon was born in Preuilly, Protestant, and made a fortune market gardening on the outskirts of Paris*. The building was never finished and today is a privately owned holiday rental. Compromised during the Fronde, a period of political unrest, Gaudon was imprisoned in the Bastille in 1649 and building work came to an abrupt halt.
*I can't remember where I got the information about Gaudon being a market gardener. CHM has pointed out to me that the real money came from the fact that he was one of Louis IV's tax farmers.