Search online for someone that creates as-builts in your area. There are companies/individuals that do just that, and it is usually cheaper than hiring an architect. I work in S. California so I can't help, but for reference, I charge around $0.05/sf for measuring and creating a drawing of office space.
Explain how and what you will be using the drawing for so you don't pay for more information than you need. Hope this helps.
Mar 2, 2012