Wanting to buy an abandoned house in NJ?

Hello, I was wondering if anyone could help as I seem not to be finding out much info on this. Short story, theres a house by my boyfriend (he lives in north bergen) thats been abandoned for atleast 4 or 5 years, and I have been trying to look up info about it (to buy if I can) but all I can find is the owners name and nothing else about the house or the owner. No other info at all about possible other owners, no whereabouts of the owner, nada (have been checking online since I cant make it up to the courthouse during the week and unfortunately my boyfriend works in nyc and cant make it there either) Can anyone tell me of any good sites that I may have missed or any number I can call, any info on finding more info or what I can do would be greatly appreciated. Thanks