Modern Residential Layout Design

I'm looking for an experienced architect or designer to create two conceptual layout options for a residential project on a 6,400 sq ft lot (approx. 142 ft x 45 ft).

Key Details:

Maximum lot coverage allowed for living space: 3,000 sq ft

Two-story construction is permitted, allowing for up to 6,000 sq ft of total living space

Existing structure on the lot is 2,200 sq ft

Requested Design Options:

Addition to Existing Structure:

Utilize the current 2,200 sq ft home

Add 800 sq ft as a two-story addition (1,600 sq ft total added living space)

Total living space: 3,800 sq ft

Full Redevelopment Option:

Remove or significantly redesign existing structure

Construct up to 3,000 sq ft of new footprint (in one or multiple buildings)

Using two-story homes, allow for up to 6,000 sq ft of total living space

Ideal Skills and Experience:

Architectural design expertise, particularly in modern styles

Experience with residential projects and zoning regulations

Strong conceptual design abilities

Familiarity with efficient use of space in both additions and new constructions

Please provide relevant portfolio examples and a brief overview of your approach.