Can a landlord for a business lease continue to collect money on a lease that was ended after its term?

There is more information needed in order to provide you with some guidance.  First, is the business still in the leased space? When did the business turn over the keys?  The landlord can probably charge for time before you compeletely vacated the unit.  Second, what specifically is the landlord asking for money for:  repairs, cleaning, etc.  Did the landlord provide estimates of repairs?   What does your lease agreement (the contract) say about what the landlord can retain from the security/damage deposit?  Read the lease agreement carefully to see what it says about what the deposit can be used for by the landlord.  Third, what does the lease agreement say about what condition you must leave the unit in when you vacate the unit?  Did you take pictures of the unit to document its condition?   These issues tend to be very facts specific, not only the words in the contract, but the facts related to the condition, and what the landlord can expect your performance to be under the contract.