The home was renovated from top to bottom including gutting both the kitchen and main floor bath down to the studs.

Finding someone to do this for you could be relatively expensive, so best you contact the city, find out the process and handle yourself.Once you have city approval, you can then hire an architect to design the new structure, or buy plans online.

For us, there are proven designs (mostly by Whirlpool), and then there's everything else:1. 

This is the DP2 - The terms that are designed where someone/something else is paying for the rest.

Use a designer experienced with short term rentals. 

We have a Carrot website which is designed to generate traffic to your page and has spots for leads to input their info.

We gutted the kitchen, and bathroom.

New roof, New HVAC TONS of landscape removal, 3 30yd dumpsters worth...Opened up pass through and walls in kitchen.

Has full Kitchen in the basement unit6.

@Tom ShallcrossSince this mentions “design” could this be for new builds and not cover existing housing?