How to Present Owner financing

[Andrew Rivera]

I’m finishing up my Bachelors Degree at Olivet Nazarene University. I found a duplex in my area for sale for $149,000. The owner has 5 buildings with a total of 10 units. I found his address online and am curious as to what’s the best way to approach him to see if he’s interested in owner financing?

Is it weird for me to randomly knock on his door?

Should I write a letter and leave it in his mailbox?

Just trying to figure out the best way to approach the seller.