On Monday morning, Charles Garney watched as the last remaining piece of an old rock quarry in Riverside was prepped for new development. Garney, with the rest of his Briarcliff Development staff and other local officials, broke ground Monday on the site of a future Marriott TowneSuites hotel. The 94-suite hotel will sit directly east of the already existing Marriott Courtyard, bringing the the total number of rooms on the site to more than 200.