RCW59.18.260 ...No deposit may be collected by a landlord unless the rental agreement is in writing and a written checklist or statement specifically describing the condition and cleanliness of or existing damages to the premises...Return it quickly to avoid any further action from them that could cause you more grief. 

If you are planning on living in the property as your primary, you can request to terminate the lease as you will be taking possession for owner occupy, but confirm with a local real estate attorney on the specific verbiage and process as it varies by state. 

Are there specific websites where I can find these or do I just need to search on mls?

Would it be advisable to sell one of the investment properties to finance this, or should I explore using a Home Equity Line of Credit (HELOC)?

I consulted with my CPA, who advised that the policy loan should be transferred to my LLC for private lending purposes.

Establish the notice time that will apply to you and the renter in the event that either decides to terminate the agreement.Remember to consult with local authorities or seek legal advice if you have specific questions about regulations in your area.

And even though virtually every sponsor agreement allows me to share investment information with others who might be advising me on it (especially when club members are bound by an NDA), I still ask the sponsor if I can share it, because it's a test.

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After that there's a specific hard money lender I work with who isn't the cheapest but they're damn sure the easiest.

As always, your CPA should advise on thishttps://www.biggerpockets.com/forums/530/topics/1056436-clearing-up-confusion-on-tax-treatment-of-short-term-rentals