I have done a couple deals with a partner where we bought a lot or multiple adjacent lots, worked with an architect to entitle the property for development, then flipped the fully entitled property to a larger developer.

The city will need plans, blueprints and possibly a variance to give you formal approval/issue permits (that's the part that the contractor and/or architect handles) but if you can give them a general idea of what you have in mind they should be able to at least tell you whether its feasible or not.   

This sentiment is actually coming from an emerging group of community-based nonprofits, architects, city planners, and community developers, who see the value of using real estate to development to better their communities by literally shaping and rebuilding them.

I am in the process of working with local Architect/General Contractor in creating preliminary plans for a condo/townhome subdivision in North Phoenix on a R3 lot.

I am also an architect. 

You hire an architect. ;)

If needed add a minimum of 15kModerate RehabCan save at least two of the following- Electric, Drywall, Flooring, Plumbing (likely touch ups in the other two)Redo KitchenRedo Existing BathroomsNo framing or architect plans neededPaintFinish BasementAdd a split unit to existing duct work (prevent from tearing up existing plaster/drywall)*Think of a grandma home that does not have knob and tube and has been on top of roof/windows so we aren’t as worried about mold/water damage*Light RehabComps do not need a finished basement or basement is finished to comp standardComps do not need HVAC or you can just add split unit to existing ductworkKitchenBathroomFloorsPaintNo major rehaul of mechanics needed (aka do not need to rip out walls)LipstickPaint, Floors, appliances in the most basic sense ARV Range Full Gut Moderate Light Lipstick +450 (A+) 150-300 N/A N/A N/A 380-450 (A) 90-120 70-75 N/A N/A 270-400 (B/B+) 85-100 60-70 N/A N/A 210-270 (B-) 75-80 60-65 45-55 N/A 170-210(C/C+) 65-75 50-60 40-50 15-30 140-170(C-) 60-70 50-60 35-45 10-20 120-140 (D) 55-65 40-50 25-35 5-15 Philly Neighborhoods Breakdown:A+ : Obvious Prime Real Estate.

Fully acknowledged that I'm not an architect/contractor with the credibility to make that judgement, but I consulted in person with several architects and contractors who all agreed that the addition looks at surface level well-built. 

Most of the demo work has been done in the home and the architect has the drawings for expanding the home.

About 60% are brokers with engineering license or architect background.