Details can be found at https://www.biggerpockets.com/forums/521/topics/1224992-brew... 

BP has built a great selection, all of them worth reading and that will help you build foundational knowledge.To answer this one: the words from old school investor Dolf De Roos "seldom sell" and you will find a lot of post on BP from people who regret selling properties in the past.

Any other books you would recommend to someone completely new to real estate investing but who would like to build a solid foundation going forward?

If you’ve got strong tenant demand, proximity to top employers, or even access to public transit, you’re laying a solid foundation.

It sounds like you’ve set a strong foundation for your real estate investing journey, especially with the time you’ve spent educating yourself.

You don't need to know everything to get started; you need a foundation to build on, and the rest will come through experience and then refining your education.You can build a basic understanding of investing in 3-6 months.

Foundations and framing were built better 100 years ago and there are some advantages to older homes.   

My book recommendations are not mindset necessarily, they're specifically tailored to passive investing and the reason for this is I think having an educational foundation on mindset and strategy are important but getting too hung up on mindset may actually keep you from taking action.

The DST is losing $ due to upkeep costs (foundation, HVAC, normal repairs, etc.).

Staying local and house hacking—especially now, before kids—gives you so much flexibility to set yourselves up for long-term success.Your financial foundation is super strong, and house hacking a quad sounds like an amazing first step for you two.