The Worthy Group, a company formed here by Walt and Karen Worthy, has started site work for an envisioned 15-story, 721-room convention center hotel, depicted in this preliminary rendering, and 900-space parking garage. The company bought a city block, located across Spokane Falls Boulevard from the Spokane Convention Center, from the Spokane Public Facilities District last month for $6.7 million. The hotel is scheduled to be completed in the spring of 2016. In documents filed with the city of Spokane, Worthy estimated the construction cost at $50 million.