Tenant Deferring Maintenance

[Manley Peterson]

I am looking at a commercial property for sale with one tenant (Chinese restaurant) on a NNN lease. However, even though the lease says the tenant must do maintenance on the building, there are several deferred maintenance items (broken toilet, bad window seals, light fixtures). The business is apparently doing well, though. The lease has about 1 year left and tenant has expressed interest in renewing for another 5 years.

So, what is the best way to enforce the lease and make the tenant fix the problems?