Found Info on a vacant house thru FB market place, randomly.

[Fernando Roman Romero]

Hi BP Family! I have been on forums for a while now. I haven't really said much just been hanging back and trying to learn but now I am tying to take some action. I would like to share with you all this house that I found and maybe get some tips on what to do. So while I was taking my dogs for a ride thru Lubbock last night, I came across what seemed to be a vacant house. There is shrub growing all around the yard and it is loaded with random things all around the house and not to mention the fence is basically rotting away. So you know I had to stop and check this home out! Well it was to dark to see anything even an address so I decided to come back the next day. Well why I was shopping on FB marketplace, I went to pick up my item from the sellers house. Well what do you know they lived right across the street of the house I had driven by the night before. After paying the seller for my item I asked her about the house across the street. She told me" you wouldn't believe it but a woman lives there and she is a hoarder and hasn't had any running water in the past few years." I was definitely shocked but she was willing to share information on how to get a hold of them and where there parents lived. So my question is how to go about the next step of purchasing this house. Do I send a letter? Try to find a phone number? Or just go knock on the door and see if get an answer, if so what to say? I kind of have an idea but would like some feedback on what you all think. 

Thank you all very much! Happy investing!