Commercial eviction in Baltimore city md

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I have a commercial office space shared by 3 tenants who are all on the lease. They each pay 1/3 and one tenant is usually on time and the other two are a week or two late, but they pay the late fee.
Partial payments of 1/3 isn't on the lease, but I accept it for their convenience.
For December 2012, I only received 1/3 from the more responsible tenant. The other 2/3 never arrived between the two other parties.
Another 1/3 of the rent came in January 2013 from the more responsible tenant. All 3 tenants don't work together at the same time or run into each other....they probably don't communicate much.

From my understanding, this 1/3 that arrived in January will be applied towards the December 2012 balance. Which leaves 1/3 rent outstanding plus a late fee for December 2012 and all of January 2013 + late fee due.

Despite several emails/calls, I don't get replies or call backs.

Is their any difference on pay or quit / eviction process for office commercial for Baltimore city Maryland. I'm familiar with residential and the necessary steps, however with commercial can I do things (evict) more aggressively?