You can cancel the lease but the Landlord may sue you to enforce the lease. You may be responsible for paying for the remainder of the lease if you prematurely terminate your lease. You may want to review the early termination provision in your lease very carefully to understand what the ramifications are if you break your lease. Some leases now just have set amount that the tenant pays for early withdrawal (liquidated damages) instead of the tenant being responsible for the remainder of the lease.
In any event, Landlord is expected to mitigate his damages after you break your release by reasonably looking for a replacement tenant. However, if a replacement tenant is not found, you would still be responsible for paying the rent on the vacant premises if your Landlord elects to enforce the lease.
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