I wouldn't worry.You can pay to have 3 more appraisers, an architect, a surveyor, and 2 home inspectors go out there, and every single one will have a different measurement. 

I have about 10yrs experience as an architect in NYC, working in large scale nyc projects for notable arch offices.

-I partner on most deals and take only a 9% GC fee which 4.5% is deferred until project close out -we are partnered with architects (both HOU/ATX markets) and have a design team so most of our equity partners are silent on the deal (unless they would like input on everything) since our team has a combined 45+ year experience acquiring, designing, marketing, and selling spec/design build homes. 

I am currently studying for licensure exams and plan to have an architect's license within the year. 

However, based on the information obtained by our architect from city Planning department this week in order to legalize as ADU we need to add a kitchen (bath is also a requirement, but the converted space has a bath already).

I am looking for the following if you could please send me contacts for: Wholesalers, property management, architects, engineers, framers, finishers, clean out crew/demo, insulators, conrete installers, window installers, tree removal. 

The plan is to convert the commercial space (currently 1 of the 4 units) to a residential unit, which I've already cleared with the city permit/inspections office and have spoken with an architect regarding the process.

An Architect already made multiple evaluations on what needs to be done and the cost.

For me, I began finding value for investors by finding them properties that were worth their time, and as an agent my benefit there was to list the property, but as a partner I was the person who found the property, took risk with the lenders, worked with the architect & engineers, went through the city meetings, worked with neighbors and the council to approve my project, worked with contractors, found tenants and manage. that all led into a massive education where one mistake was made after another and it provided lessons that I am able to share with others to help them grow (also the major benefit of BP), but really its not until you get into It where you will really learn, because its likely those mistakes will happen. 

@Ric Mittleider Just saw this post on the forums and thought I'd reach out, I'm a local architect and owners rep with experience in housing off all shapes sizes and budgets multifamily included.