A commercial buildout, or tenant improvement, involves customizing an interior commercial space to suit a business's specific needs. This typically occurs in a shell space or an existing structure requiring significant modifications. It can include installing new walls, flooring, ceilings, electrical, plumbing, HVAC, and specialized fixtures. The goal is to transform a generic commercial unit into a functional, aesthetically pleasing, and code-compliant environment tailored for the tenant's operations.