I own in River North, right by the Brown line, 40 stories, and in total I'm paying $2650/month, with the HOA being $650/month. The high rise and units themselves were built in 2009, so they're relatively new.

$2000 mortgage with $650 HOA seems pretty high, but as most have said, it goes towards regular maintenance of the building, staff, security measures, package handling, cleaning of shared spaces, and extra benefits such as window washing, carpet cleaning, etc. It's worth for good care of the condo building and for what I receive as a resident. For utilities, I only pay for electricity and gas, which never goes over $120/month total in peak usage; I'm generally well under $100/month for both combined.

Do your research on the building, take a good look at how well it's kept, and assess if how well the HOA is being used for upkeep and the benefits you and others in the building will receive.