What are the best resources to learn about non-residential commercial real estate?

[Liam Delumpa]

I'm looking to transition from multifamily into non-residential commercial real estate and am looking for recommendations on books or any online resources to learn more about the space. As of now, I am most interested in multi-tenant retail and suburban office. But I have realized that with more education, my interests my change. I am trying to find resources to absorb more information around non-residential transactions, due diligence, leasing strategies to add value, etc. 

Thanks!