Public easement that runs with only half of a privately owned sidewalk in California

I live in an old part of LA. My condo building was built in 1911; an adjacent building was built in the early 1900s too. I noticed that the two buildings' condo plans are different with respect to their easements dedicated to the City. For my building's condo plan, the easement runs from the building all the way to the center of the street. But for my neighboring building's condo plan, the easement is only 5' wide, and runs from the sidewalk curb toward the center of the sidewalk. (The sidewalk is 17' wide, so the easement doesn't even reach the center!) In other words, there's a 12' portion of what an ordinary person would consider the public sidewalk that appears to be privately owned property. What effect, practically or theoretically, does that have for loitering or trespassing