With all of that said without know more specifics about what price points you're considering and location I'm going to Generalize1.

What are the specific legal grounds for eviction in this situation, considering the tenant's behavior, lease violations (including the unauthorized movement of furniture), the failure to submit a work order, the late-night disturbances, the harassment of my son, the unreasonable demands regarding property access, and the potential safety concerns for myself and my son?

The restrictions, requirements and timelines on these are very specific and one mistake can be very costly. 

We've even purchased, rehabbed and then sold properties to specific investors before.

Shoot us a PM if you want to brainstorm specifics.. or if you're curious how I've worked through this with properties in Phoenix and San Antonio.

Investors can always benefit from working with someone who knows how to align opportunities with specific strategies.Are there particular types of properties or investment strategies you’ve seen gaining traction in the Seattle area lately?

This means you'll want to "write off" expenses related to a property you have in service because if those expenses don't benefit you this year they could in the future once you sell the property.We can get into a lot more details with the "if" "and" or "buts" BUT I think this would be the "simplest" answer without diving into your specific situation here.I hope this helps! 

The answer to this question will often be specific to the property and also to the municipality.

Any recommendations on local networks or specific methods that have worked for you?

looking to accurate my rehab costs calculator, specifically in the Pittsburgh area.Of course, It varies from one investor to another, depending on the quality, standard, size, condition, and team.I am looking to get a range or see how much you pay for each remodeling. 1) what's your range for remodeling a kitchen completely (granit, backsplash, tiles, etc)?