There is nothing that the IRS says about how long you have to wait do a refinance.

I am currently a resident in LA county however I own a rental property in Burien, WA. It

That is disaster waiting to be uncovered.

You're still waiting ten years].The main counter-argument used here on BP is: How much more could be achieved with that extra $100k than merely paying off a low-interest-rate mortgage early?

You find the numbers, and strategies that work in any specific market you choose, then wait until a property pops up that meats that criteria, and jump on it."

While I continue nurturing those realtor relationships (and patiently waiting for my phone to ring), I'm curious to explore other avenues for sourcing off-market deals.

You may pay 1.5m and up for a good one, likely more if parking and balconies, but the play is to buy a multi and then wait and in a few years, turn them into condos and sell them separately - that's how you make the money there.

That is assuming your DTI can cover the increased mortgage payment.If you have use for that extra $100k that you would get back right now then don’t wait.

i provide dishwasher if we are putting a new kitchen. also a garbage disposal.sometimes i provide washers/dryers if i have extra laying around (i always seem to have them).sometimes i have purchased fridges and ovens since it's best to invest in capital expense and get a tenant than to have a house sit empty forever.our lease also states that tenants should purchase the appliance plan, which noone really does purchase. 

You want to wait after the work is complete before you get an appraisal and do not do it until you are refinancing because most lenders will want it through the AMC and you will be out your money.