Are you searching for buildings with 1-4 units, or 5+ units. If you are searching for small apt buidlings, we may be able to help you.
I am a licensed Broker in NJ, and service your area for commercial and land only. We do not do residential in your area, nor do we have MLS access for your area. I haven't seen any RE Pros from your area post to Trulia recently. Perhaps one will chime in on the residential side (1-4 units). If someone doesn't chime in, you can look at http://CRS.com
and search for a CRS agent in your area.
If you post back w/ more details, that would be helpful. Try Loopnet.com and costar also.