Zoning Changes in Denver

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Hey everyone! I failed to do my homework on an investment property in Denver. Has anyone in the area had success in getting a residentially zoned Duplex Amended to a Triplex? 

I tried the ADU route as the lot size fits but since it's zoned as a duplex it doesn't work and the third nonpermitted unit is the basement unit so the townhome permit doesn't work.

Does anyone in the area recommend using a lawyer to help navigate the process? I don't qualify for it being a triplex given the lot size but the property currently functions as a triplex; the third unit (basement Unit) is not permitted and doesn't have an address. 

Has anyone had any success in this area?