Here is only a portion of the actual code section
When the adjusted construction cost, as defined, exceeds the current valuation threshold, as defined, and the enforcing agency determines the cost of compliance with Section 11B-202.4 is an unreasonable hardship, as defined, full compliance with Section 11B-202.4 shall not be required. compliance shall be provided by equivalent facilitation or to the greatest extent possible without creating an unreasonable hardship; but in no case shall the cost of compliance be less than 20 percent of the adjusted construction cost of alterations, structural repairs or additions.
If you believe you qualify for the Unreasonable Hardship exception you may first want to consult a CASp before submitting documentation to your jurisdiction. A CASp may be able help you curate options, see if equal facilitation components may serve your needs better.