For those interested a good paper on job clustering, downtowns and number of jobs.
Note - Downtown Jacksonville, in pure number of jobs, is on par with Peoria, Illinois and Knoxville, TN.
In terms of ratio of jobs in the core versus the metro, Jacksonville is on par with:
Dallas, Tampa, Salt Lake City and Detroit.
https://journals.sagepub.com/eprint/QNASWC5KXIVYJHJ9CRQT/full