His usual architect isn’t taking new projects.How do I determine which architect is the best fit?

@Moises R Cosme is correct that if this is the case, You as the homeowner can pull the new permit yourself; however, if you needed to pursue a Full Permit Process in cases for projects including new construction, additions, or larger remodels, the City of Chicago requires the permit to be obtained thru a Licensed Architect, Licensed Structural Engineer, or a Permit Expediter.Since I am assuming this was an Easy Permit for the plumbing, you also don't need any plans to be submitted.

Question is are any of the fees paid for contractor/architect/permits allowable for any tax offsets/carryovers/etc for tax filing? 

I dealt with the city because I wanted to go through the process and they're way nicer to owners than they are architects/contractors.

There are building codes to follow and if it's major wall moving, you will need an architect or engineer.

So now imagine if you get a home at 80% of value: thats a fixer: and you add 1000 sq ft : you can then refinance that home and pull out most of your investment or more and do it again.I suggest this because I assume that you will be able to do it for this price, bc you also know how to work with drafters and architects and you know your way around the city! 

Hiring an architect is probably a good idea, although I have not.

I’ve had a passion for real estate since I was 19 years old so I work for an architect firm to a real estate firm.

2)   What should I budget for this project for the architect/engineer/permits? 

The downside is it can take 1 year to get all permits, get designs done by architect, and get the new homes built.