Building Modification Drawings

I'm seeking an experienced drafter to create and adjust architectural plans for a current building. The final drawings should be in PDF format.

Key Requirements:
- Draw the current building accurately.
- Modify existing layout as per new plan and upgrades.

Ideal Skills and Experience:
- Proficiency in architectural drafting
- Experience with layout modifications
- Attention to detail and accuracy
- Ability to deliver in PDF format

Please provide samples of previous work and a brief outline of your approach.