Phased Mixed-Use Complex Design

I need a complete architectural proposal for a mixed-use commercial complex on a 50 ft × 70 ft plot. The brief starts with a first-phase build: basement parking covering the full footprint and a ground-to-third-floor superstructure. Subsequent second and third phases should be anticipated in the concept so that the construction can be extended seamlessly without demolishing or weakening the initial frame.

Key considerations
• Efficient ramp and circulation for basement parking sized for standard sedans and small delivery vans.
• Flexible ground-floor layout that can accommodate retail now and convert to other uses later.
• Two upper levels earmarked for offices or co-working; service cores (stairs, ducts, washrooms, elevator shaft) must align vertically for economical expansion.
• Local building codes on fire egress, accessible entry and minimum light/vent ratios must be observed from the outset.

Please deliver:
1. Concept sketches showing massing and future expansion zones.
2. Scaled floor plans, sections and elevations (AutoCAD or Revit preferred).
3. 3D views sufficient for client presentations.
4. A short structural narrative identifying column grid, slab system and how extra floors can be added.
5. Parking layout schedule demonstrating capacity and turning radii compliance.

I will be available to answer zoning or by-law questions quickly so you can focus on design.