your remedies are state specific. if WA is an attorney state, consult with the atty.

Learned a lot about environmental issues and soil remediation.

In my leases I clearly write and explain to tenants that we will remediate any issues uncovered in the 1st 30 days at our own expense.

You need to decide if you seriously want to pursue a remedy.

Once you know, you'll be in a better position to respond.BTW, while suing for specific performance is a real remedy, it's going to be expensive and slow. 

I also requested additional documents like estoppel certificate, mold remediation that the seller isn’t able to produce.

Seems like the quickest and easiest remedy to this situation..

I would ask them for a remedy to the "too much" situation... might be fun to pick their brain. 

Termination of periodic tenancy).I'm not quite certain what the landlord's remedies are if you don't provide such notice.

If you're in software development, you're good at what you do, and you're not focused on some bespoke in-house developed platform that no one outside of your organization has ever heard of - Austin will be a better job market for you than Philly.