Help with contact info for abandoned property?

[Josh Mitchell]

Hello all, I have a question for those who are involved in flipping. Recently, I have found a neighborhood in my area that I would really like to get into, and have found 2 properties in specific that I would like to purchase. Unfortunately, these two properties are not listed S for sale. But, they are definitely uninhabited homes. I have done some research, and found the names of the owners through the tax records, 1 who I cannot find a number or address for, and another who was recently convicted of a felony and I have his home address. What would be the best method for finding more details and approaching the owners to purchase? Also - on an unrelated note, if a selling agent says that a house is likely a tear-down, can you always take their word for it? Or is it good to investigate further. If so, how do you investigate if the property owner doesn't want to let you inside? Thanks - josh