The terms of the OA provide the only mechanism for you to exit the LLC, short of litigation. There should be several paragraphs that address the exit by a member and buyout procedure.
Typically, the terms include the exiting member recuping his/her initial contribution. Where the LLC has been profitable, it could include a share of those profits equal to the members % interest. Again, however, these issues will be addressed in the OA.
To initiate the process, I would send a certified letter return receipt requested to each of the other members stating your withdrawal and demanding the distribution you are entitled to based on the OA's terms. In the rare event that the OA is silent on the matter, then I would demand the monetary equivalent of my full membership interest.
As long as you did not personally guarantee the lease, you will not be responsible for it upon leaving the LLC.
Please let me know what follow-up questions you may have.
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