interior design

I am looking for an experienced interior designer to help with the design of an existing large commercial space. The exact size of the space is more than 3,000 sq ft and I don't have a specific style in mind - I am looking for the optimal design to meet the needs of this commercial environment. The successful candidate must be able to come up with unique, innovative designs while also considering practicality of the space and utilizing available resources. I strongly prefer someone with a portfolio of projects successfully completed.