This document provides estimates for leasehold improvement costs for three levels - basic, upgraded, and premium - of brick and beam office spaces. The basic office is estimated at $34-45 per square foot and includes painted drywall partitions, solid core doors, mechanical and lighting updates, and paint. The upgraded office is $46-58 per square foot and adds features like drywall reveals, vinyl wall coverings, and pot lights. The premium office is $59 per square foot or more and includes upgraded finishes, wood doors, glass partitions, and custom millwork. The estimates are based on assumptions around space size and scope of work. Additional costs like furniture are not included.