Joe Jarusinsky, Realtor/Master Instructor, Keller Williams Realty, Austin's #1 Real Estate Company, Ranked #1 by Buyers and Sellers (JD Power & Assoc. 2012) Call 512-261-4415
It depends on how you finish out the space. Very broadly, $100-150/foot is a range I've seen this year for jobs adding 1000sqft to 200sqft. You can spend more, or less. Find a good contractor, share your ideas and plans and go from there.
John Crowe, Broker
Hope this helps.
Don Groff | REALTORÂ® & Mortgage Broker
Austin Real Estate Pros & 360 Lending Group
o 512.669.5599 | m 512.633.4157 | email@example.com
websites: http://www.AustinListed.com | http://www.360LendingGroup.com