We have just started a new LEED CI project on LEED Online. They now specifically asked you to separate the space by initial fit-out, alteration, and space undergoing no initial fit-out or alteration work. My suggestion would be enter the total tenant space GSF and then separate it into the above.
I might be wrong, but if you only give them the space size that will be changed and added only, than you would end up calculation less bike racks. So not really enough bike racks for all tenant's occupants as defined in the credit language. Very interesting questions. I look forward to other peoples opinion on your topic.