Previous Expansion Encroaches on Property Line

I bought a property with two structures in 2014. I later found that the second structure cannot be occupied as a residence because a later expansion encroaches on the property line, making it non-conforming.

I want to remove the expansion. The builder created the addition by extending existing load-bearing walls and constructing a new clear-span exterior wall. If I remove the add-on, I will have a 5′ setback the city code requires.

I have been unable to hire an architect to provide necessary plans to show how I will support the original structure because all local architects are too busy, and the job is small. How can I get a set of plans to submit my project to the city?