Attorney Ranj Mohip is a Chicago real estate attorney. The information in this answer is general information and is not intended as legal advice. Further, answering this question or otherwise contributing as a member of Trulia.com does not create an attorney-client relationship. Remember--consult the best real estate attorney in Chicago or in your respective area.
- You would likely need approval from the Condo Board, in writing, legally binding. Have an attorney draw up everything. No sense in wasting money if the Board won't go along.
- Structural (joist) load is different for occupancy space than a deck. Joist/truss size and load capacity at the roof level would need to be verified and/or upgraded for full occupancy. This would be one of your major costs.
- The overall structure would also need to be verified for the extra load.
- You would need at least two means of egress from this level regardless of square footage because it is more than 2 levels above grade.
- Height limitations may apply
- Get an architect to do an initial review.
Hope that helps