I'm trying to find out if it is OK for me to aggregate commercial real estate listings from individual brokers sites and put it on my site (with all of their information on their correctly, phone, email, website, etc). The objective being to create a source for niche commercial property buyers to use.
If you simply aggregating information than I don't see any issues with copyright. But, I would seek permission from the brokers/website owners to make sure business is protected. It doesn't hurt asking for permission, and if it directly benefits them to get leads/sales than none of them will say no.