I emailed the contact email address to ask questions and they were very quick to reply. 

To make sure I use the right verbiage and it is correct?

Got them the foreign entity doc within 2 hours, and sent a party wall agreement (which was completely inappropriate for this deal, not the correct form at all - but I signed that form on both sides, literally making an agreement with myself, which they accepted!

As @Upen was referring to I didn’t have the interest correct in my analysis due to lack of knowledge of the higher interest rates for portfolio loans compared with owner occupied primary mortgages.

thanks for the replies.

I know that the Zillow estimate isn't going to be 100% correct, but based on what the first floor looked like, the sales price of other two flats in the area and my own knowledge of the area, I now feel like we should have either offered quite a bit less or walked away.

When the market corrects itself or slows down, they may need to dump property to survive.

I suppose I failed to do this in this case and now must have a corrective discussion. 

@Ray Harrell, Thanks for replying the message. 

I haven't figured out how to close or delete a discussion yet, so I will post a new one with correct numbers.