Estoppel Certificate – Can be requested by the landlord after signing the lease to confirm that there is a rental agreement between the tenant and the landlord. The terms of commercial leases differ depending on the specific property and the company that owns the lease. Terms are often negotiated between the two parties to determine: Part II of the Law of Property Act 1925 also sets out the requirements for agreements to be executed by deed. In a net lease, none of the operating expenses are included in the rental price. Therefore, in addition to the base rent, the tenant must pay their proportionate share of the three “net” operating costs – property taxes, non-life insurance and common area maintenance (CAM). Cam generally also includes incidental and operating costs for the community sector.