Coast Guard Shore Infrastructure Improvement Act This bill addresses U.S. Coast Guard shore infrastructure. The bill directs the Coast Guard to (1) develop a plan to standardize its facility assessments; (2) establish shore infrastructure performance goals, measures, and baselines to track the effectiveness of maintenance and repair investments; (3) develop a process to routinely align its shore infrastructure portfolio with mission needs; (4) establish guidance for planning boards to document inputs, deliberations, and project prioritization decisions for infrastructure maintenance projects; (5) employ models for its infrastructure asset lines; (6) include details about competing project alternatives and report tradeoffs in congressional budget requests and related reports; and (7) explore the development of real property management expertise within its workforce.