Austin Landing will see more office development this summer. RG Properties announced Wednesday it has signed two new office tenants to occupy a new four-story, 85,000-square-foot office building with first-floor retail. The building will be located near the park area that includes the Dewey’s Pizza and Firebirds Wood Fired Grill restaurants. The identities of the new office tenants were not revealed. “RG Properties has signed leases with two anchor tenants and is working with a third anchor…