Final answer:
The disposition of security deposits for commercial tenancy is generally defined by tenancy agreements, which are specific to each landlord and tenant relationship and may be influenced by local regulations and national laws.
Step-by-step explanation:
The amount and disposition of security deposits for commercial tenancy are typically defined by tenancy agreements. These agreements are contracts between landlords and tenants that outline the terms of the tenancy, including the security deposit. Through these agreements, both parties have an understanding of the responsibilities and expectations concerning the deposit. Although local regulations and national laws can influence these agreements, they do not directly determine the specific terms which are often negotiated at the discretion of the involved parties, unless otherwise mandated by law. It is important to note that zoning regulations or government restrictions may affect business operations, but do not directly dictate the terms of security deposits. An understanding of one's rights and responsibilities regarding property and tenancy, including matters like security deposit amounts and conditions for refund, can alleviate potential stress during lease termination or conflicts.