So, in my opinion it would be good start to find out if you can actually do an ADU, than find a good Architect.

After working with an architect, we realized that it was going to be less expensive and less work to tear the house down to the foundation and rebuild it than it would have been to just add a 2nd floor. 

However, I had a architect/engineer friend look at it and they are not.

A GC manages and pays all of the subcontractors and suppliers, works with the architect/engineer, coordinates permitting and inspections with local building departments, does accounting and billing, and works with the client to make sure the project meets their expectations.  

I will say in most jurisdictions an architect is not required for a duplex so you dont have to go to one.

Everything is outsourced turn key to architects, engineers, general contractors and Realtors.

Once you get a survey then you can take that to an architect to do a feasibility study to see what you can get on the area thats left. 

We will appreciate if you can recommend a REI in NYC, as well as connections with Investor Real Estate Brokers, Wholesalers, Mortgage Loan Officer, Contractor for small/big job, Real estate lawyer, CPA; possibly Architect, Engineer. 

We will appreciate if you can recommend a REI in NYC, as well as connections with Investor Real Estate Brokers, Wholesalers, Mortgage Loan Officer, Contractor for small/big job, Real estate lawyer, CPA; possibly Architect, Engineer. 

Her architect is cheapest she found but obviously is not very good and on top of that doesn't speak English that well... so now is charging on revisions).