If you don't get approval from your landlord to sublet then you run the risk of them finding out and penalizing you, and even starting eviction proceedings. 

The decision to take on this risk or not is up to you. In either, case you will still be the one on the hook for the rent so you should make sure you find a subtenant who is reliable and will pay rent before the first of the month, when you have to pay the landlord. Read about the Flip Rent Guarantee here

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