Go to the specialists in online commercial real estate listings

Websites that specialize in business property listings generally have the most complete inventory of commercial properties for sale and for lease. Some sites require you to register as a member before searching the listings. Most sites offer free registration, while some offer enhanced access for a fee.

I recommend: LoopNet has the largest number of business property listings nationwide and lets you search by type of property, price and square footage. Black's Guide provides listings in 10 major markets and lets you search for commercial real estate brokers in those markets. You can scan commercial real estate listings for commercial property for lease or sale in approximately 40 markets at BizSpace, which is run by American City Business Journals.

Check major commercial brokerage sites for business property listings

Major brokerage firms post their commercial real estate listings on their websites for free viewing. Of course, only properties they are selling or leasing are included.

I recommend: Top names in commercial brokerage firms include CB Richard Ellis, Cushman & Wakefield, Grubb & Ellis, Marcus & Millichap, Colliers International, NAI Global and Jones Lang La Salle.

Hire a broker for help searching business property listings

Commercial real estate brokers know the ropes when it comes to commercial property for lease or sale. These experts can help you zero in on the right property and can help you negotiate the sale or lease.

I recommend: Brokers can be particularly useful because they have access to the subscription-only CoStar Group, considered the best of commercial property listing services. Use the directory of real estate brokerage firms and brokers at Business.com to help you find an expert or try the Society of Industrial and Office Realtors, the leading industrial and commercial real estate association.

Narrow your search for commercial property for sale or lease

Targeting your search when using commercial property listing services is essential for a successful search. The more focused your search, the more likely the search results will meet your needs.

I recommend: Cityfeet.com lets you search for commercial property for lease or sale by type, including industrial, retail, office, showrooms or medical offices. Find additional sources for retail real estate at Business.com.