Use Bloomberg, available in the Margolis Market Information Lab (MIL) at the Business Instructional Facility (BIF).

• Type RMEN and hit GO for indices of the world.
• Type NI REL and hit GO for news on real estate and REITS.

Use WRDS, also available through Business Information Services. 

• Choose the dataset CRSP and then select Ziman REIT.

Also try Value Line.

For articles about REITS search the following:

• ABI/Inform
• Business Source Ultimate

For websites go to:

• Investopedia.com
• REIT.com