When speaking to a potential seller what should be addressed regarding the property before making an offer? (offers will mostly be made sight unseen) 

We can find the basic information found on tax records and public databases, but what else do we need to know specifically before making an offer?

Here are some that come to my mind: motivation to sell, recent renovations, condition of the property, what else?

When does asking what type of offer (all cash or financing) come up? Thank you