Adding an extra bedroom in a condo

[Hope N.]

Looking to get more information about a 1,000 sq ft property I own that's currently a one bedroom. Does anyone have experience building a wall in a high-rise condo to create an extra bedroom, specifically in Chicago? I know NYC has cracked down on building codes, but if there's already a closet, window, ventilation, and a light switch, and I want to build a 3/4 wall in the enormously large living room...is there anything else I should consider? Examples: Is it considered a structural change? Do condo associations usually have a problem changing the floorpan? Would the city have to issue a permit? 

Thank you! I'd love to get better informed.

PS I know some people feel strongly against investing in condo buildings for valid reasons. Personally, I invest in condos that don't have rental caps and where the HOA fees cover most of the maintenance. I like to invest as a supplement to my full time job and have enjoyed renting out condos so far.