Direct lease space is more expensive and more stable while sublease space is less expensive but shorterterm in nature. First, do you have a written lease with your landlord?A commercial sublease is an agreement to lease space from a tenant rather than directly from a property owner. In a sublease, an entity is both a lessee and a lessor for the same underlying asset. However, it probably violates the terms of the lease that they signed because most leases prohibit subleasing without approval of the landlord. In a sublease, the new tenant can occupy the space, but the former tenant is still responsible for the requirements dictated in the lease. Less Detailed Lease Negotiation. Sublease agreements are typically shorter in length and more simplified as compared to master leases. RISKS. Subletting is a real estate arrangement where a tenant leases their rental property or part of it to another individual, known as a subtenant. This is when a landlord, usually through a commercial real estate broker, offers space in their building for prospective tenants to lease.