Full service leases and net leases are quite different from each other. Full service leases typically contain a base year expense stop, which means that a tenant will not have to pay any operating expenses in the first year, but if expenses increase beyond that point, they will have to. In contrast, net leases usually require a tenant to pay a significant portion of the landlord’s operating expenses. Triple net leases (NNN leases) are generally the most comprehensive type of net lease, and require a tenant to pay for all operating expenses, in addition to rent. Bond leases, while relatively uncommon, are even more encompassing, as they mandate that a tenant pays for rent (and repair/rebuilding expenses) even if a property has been destroyed or has been condemned. Double net leases (NN leases), usually require that a tenant pays insurance and property taxes, while other expenses are taken care of by the landlord.
Source: www.commercialrealestate.loans/commercial-real-estate-glossary/full-service-lease and www.commercialrealestate.loans/commercial-real-estate-glossary/gross-double-net-triple-net-lease