Any ideas from designers, architects, rehabbers would be appreciated.

Can you use a draftsperson knowledgeable on local building codes to draft your plans along with a structural engineer signing off, or do you need a licensed architect?

To speed up the process pay a low tuition fee on your local architect and engineer to walk you through the process of permits, drawings, timelines, etc, half a day or a day should be enough on the details on the process of building, since you are paying for their time, ask ALL the questions you need.

I am an architect.

I am an architect in Toronto, Ontario and just beginning my journey in real estate investment and development.

I do have an architect currently developing some 3D blueprints for me. 

An architect will have a ballpark but +/- 15% accurate.

An architect developer in San Diego named Jonathan Segal did something similar in addition to his main development business.

I'd send a flyer (withe a link to a single-property web site) directly to local designers, architects, and contractors, who might have clients looking for a project.  

Inspections were passed for Footers / Slabs, Rough Elec, Rough Mechanical, Lintel and Frame in 1998 but Final Elec, Final Mechanical etc have not been.In case it's of interest, the house is complete up to rough electrical and plumbing and drywall is up but not tapped / mud etc.My concerns are that I'll need to invest way more than I've budgeted for professional services (Architect... maybe attorneys etc ) in order to get re-permitted since it's been 18 years since the process was started.I've already paid a visit to the City building department and am awaiting a call back... just wanted to know if any of you had any words of wisdom.Thanks!