The point is a single person can hold more than one idea. 

My plan is 3.5~4% downpayment to keep the most cash in hand.I am ready to connect with lenders, but have no idea how to calculate the potential pre-qualified amount. 

If you want to provide proper notice (ie: you don't get a response from a txt) that proper notice in Washington state requires that a notice be "served" Guidelines here: (also keep in mind that date of service is day zero)How to serve a notice1.

I agree with @Joel Bongco, that flood light with camera outside and on interior is a good idea. 

They claim rent includes washer and fridge working properly. 

You can also check on the rental estimate at Zillow and you have a fair idea if the property is cash flowing. 

Any creative ideas on how to make this happen?

Take ownership of your mistake and learn to do the proper due diligence recommended above😊

Same idea, the cost of a roof for a building housing 12 units is less per unit than building 3x fourplexes.  

So yes, creating the LLC for your business is a good idea even if you don't immediately transfer properties into it.Question #2: Transferring your properties into an LLC does offer liability protection, which can be crucial in the event of legal issues.