Vacant house - owner says not for sale - what is your strategy?

[Isaac El]

I am new to cold calling - can definitely use tips from the pros on BP

Went driving for dollars and got list of a bunch of vacant houses that are in very distressed condition

Got the owners information

Call the property owner, introduce myself, ask "Would you be interested in taking an offer on your property" or "I am interested in making an offer on your property"

property after property, call after call, I get "not for sale" or "no" and they hang up.

What is wrong with my pitch? very demotivating.