Sorry to mislead; I got out of that business and haven't worked in AutoCAD in years - my point was more that for anyone to take the job they'd need more information, which you kindly provided above. Good luck!

Probably need more detail for anyone to take the job. Are you looking for exterior only? Interior/exterior? Any amenities to go into the model (vanities, furniture, plumbing fixtures, etc)? Your estimate of a day in CAD makes me think you want more than just the exterior, but nothing close to a full interior.

How old is the building? I did a brief stint in contract engineering and we spun up all of our plans in AutoCAD before handing off to the builders. If the building is 30 years or under there's a decent chance the CAD already exists, you just need to find the original architect or engineering firm.