No, the policy only has to cover purchasing performed by the building and site management. You don’t need to impose purchasing requirements on your tenants. Be sure to state the scope of your policy clearly to avoid confusion (in this case, purchases under the building management’s control). Remember that you do have to account for tenant purchases if you attempt any of the credits (with the exception that you can exempt up to 10% of the building’s floor area). Giving a copy of the purchasing policy to tenants and explaining its purpose and benefits can help you achieve the purchasing credits.