If lenders are only offering  to finance 35% of the value, then your ratio of debt to {household} income must be high enough the lenders do not think you can handle a greater debt load. 

@Robert Adams I wouldn't recommend filling in the pool with concrete as concrete has a density of 150lb/ft3 and water has a density of 62lb/ft3 so it would double the weight of the pool.

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The striking similarities between financial success and weight loss (the latter of which I am amazing at) are startling.  

I have a title company in mind that maybe can help, but I do not want to spend loads of money for the information. 

There's LOADS of info in them that can definitely help out and will bring to light tons of ideas that you might not have thought of before.

Finding a solid property management person is difficult, time consuming, but they can be worth their weight on gold.  

This is a last resort solution that may only hold weight in Washington, but neither of us are qualified to say.  

Even if you do not use the attorney for the full process a 1 hour consult is probably worth it's weight in gold.

You should also be aware of what plasticizers were uses to make the products as that has become an issue (CNN had a big article about Home Depot's removing a certain one by the end of 2015).Finally yes there are other options but they all have their pros and cons; Ceramic has weight issues but is very durable, Wood in a rental (GOD FORBID, unless you're good at refinishing the stuff every time a tenant moves out, hiring it done is more money out of your pocket) is not something I'd recommend unless this is a high dollar real unit.