The linked "fact sheet" is, well, oddly light on facts. 

Hi Everyone,I hope you’re well.

Investors way more experienced than me suggest building a portfolio of high quality properties that produce well instead of a ton of low quality under performing properties. 

An additional benefit of a detailed engineering-based Cost Segregation Study is that it can increase potential insurance premium savings as well as provide support for the property tax appeals process.

I asked this very question to former head legal counsel of well-known title company here in CA.His answer: “It depends.”That was helpful.As the prior poster indicated, each of these cases are unique and have their own facts and circumstances.

Are your units separated well?

Hey Min, Can you send me a list as well?

I'm a "newbie" by definition with one duplex under my belt but would be interested in meeting up as well to share stories and explore opportunities.  

Hey Bigger Pockets Community,I hope everyone is doing well and continuing to navigate the ever-evolving real estate landscape.

Similarly, it's almost guaranteed not to have a sewer connection which would need to be added as well.