Leasehold improvements, also known as tenant improvements (TI), are the customized alterations a building owner makes to rental space as part of a lease agreement, in order to configure the space for the needs of that particular tenant. These include changes to walls, floors, ceilings, and lighting, among others. In actual practice, these customized tenant improvements usually have a useful economic life of 5 to 10 years, which spans the average commercial lease term.
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