Moving to an apartment community which has its own Comcast plan

I’m the current Comcast user and already had a contract of 2-year $60 plan. However, I’ll move to a new apartment where its community has a special $50 plan for all the residents living there, which will directly charge us on the monthly rent. Therefore I’d like to cancel my current $60 plan while moving out to the new apartment. How should I process this? I cannot do the transfer online given the new plan is a special agreement between the new community and Comcast. How should I do?