We also have some of their contact numbers just in case if we needed them for anything.

I was just in Maryland and DC and theyre building up every block!

@Justin FoxI was informed earlier today, I should have a formal response to my letter - requesting a date and time when they believe they will have full payment; The letter is expected to arrive no later than next week.If the terms of the promise letter is something we can not agree upon, then asking the tenants to leave voluntary could be a viable option. 

If they checked the 'yes rate is locked' box and for a time period that covers the loan time but didn't actually file the paperwork and you lost a deal it sounds like you have a pretty clear court case...Sue them, maybe just in small claims, for the interest difference over the term between 3.5% and 5%, in my opinion.

Any other solutions / advice would be greatly appreciated.Here is a link to the property just in case its needed: https://www.redfin.com/WA/Lacey/6116-Glen-Mary-Ln-SE-98503/home/15687705Thanks,Simon Wold

That's some good insight, thanks @Justin R.!

I don't know the area just in general. 

I plan for a 6 month hold time from purchase to sale closings when I run my numbers just in case. 

You can save all your lists again for easy access (although I would save all the criteria on a separate doc stored on your computer or cloud service just in case listsource.com wants to burn all their paying customers again). 

But I'll keep your name on file, just in case we might need you in the future!