LoopNet
The largest on-line database of commercial real estate sales and lease listings.  Includes searches for Land, Office, Retail, Industrial, Apartments, Hotels and other types of property.

CoStar
Provides building-specific information through a proprietary database of commercial transactions.

Knoxville Area Association of REALTORS
The Knoxville Area Association of REALTORS® Commercial Investment MLS exists to help professionals share commercial real estate information in the greater Knoxville, TN area. It‘s a database of commercial property listings & recent sale/lease comparables, and a tool for research, marketing, communicating & networking.

Appraisal Institute
The Appraisal Institute is an international membership association of professional real estate appraisers, with more than 18,000 members and 99 chapters throughout the United States, Canada and abroad. Its mission is to support and advance its members as the choice for real estate solutions and uphold professional credentials, standards of professional practice and ethics consistent with the public good.

Greater Tennessee Chapter of the Appraisal Institute
Greater Tennessee Chapter of the Appraisal Institute strives to support and advance its members as the choice of real estate solutions and maintain professional credentials, standards of professional practice and ethics consistent with the public good.

Real Estate Appraiser Commission
The Real Estate Appraiser Commission strives to protect the public welfare by ensuring that only qualified persons are licensed or certified and that all licensees uphold the highest appropriate professional standards of practice, independence and competency.