The Michelin Green Guide « Châteaux de la Loire » says that Loches — like nearby Chinon — is a town where, once you are in it, you won't see any modern buildings at all. The whole place seems to be frozen in time, and that time is the French Renaissance that blossomed 500 years ago. What Michelin says is not far from true, except for the the shops and boutiques at street level.
These photos show the Porte Picois, "the very image of a late Gothic town gate" (Cadogan « Loire » guide), set in ramparts that were built to protect the lower town. Just to the left of the gate, seen from this angle is the Hôtel de Ville or town hall, which occupies a house built in about 1535.