Hello Madison and thanks for your question/post.
So, let me make certain that I have all of the facts. You are the owner of a 2 unit condominium homeowners association, where you were the sole owner for many years. During that time, you've made changes to the lower condominium that might affect the common areas as well as the map and plan of the condominium.
I hope this is all correct.
Okay, first, you do not need to change your CC&Rs prior to selling the home unless there are rules within the CC&Rs that you would NOT like to pass along to the new owner. As the sole owner of the homeowners association, you can make these changes now without the intervention of another (possibly) dissenting owner. So, as to your question about changing the CC&Rs, you certainly can do this as the only owner of both units in the HOA.
Second, regarding the changes that you've made to the condominium unit, provided that such changes do not violate the building codes within the City where you live, file a formal architectural application to remove the second exit from the lower unit. I suspect that the City may require you to reinstall the second exit in the lower unit for safety purposes--usually a building is required to have at least two pedestrian exits, so check with the City first.
I hope that this answers some of your questions. Good luck and happy selling!!
Grace Morioka, SRES, e-Pro
Agent, Facilitator and HOA Expert
Area Pro Realty
Co-Author, "Homeowners Associations: A Guide to Leadership"