520 S Water Prime Commercial Opportunity with River View! This standout building offers a beautiful view of the St. Clair River and a spacious interior with plenty of flexibility for a wide range of uses. A large window fills the space with natural light, and the location puts you right in the heart of Marine City’s lively downtown—steps from shops, dining, and seasonal events that draw both locals and visitors. With excellent visibility and steady foot traffic, this property is a standout in a charming, walkable community.