The capital stack especially in CA is VERY complex and typically involves everything and more that you mentioned.

If you decide to go the multifamily route, Real Estate lab .com is a multifamily software for deal analysis plus they have many other useful features. 

The reality is the land has value.I believe you are typically far better purchasing a different property with conventional financing than adding an ADU.  

4) What do their places look like, how do they feature their professional pictures?

It's not a giant burden right now, but with AI and duplication posts, it's becoming much easier to spam overall.I still find the biggest 'issue' on the Forum is what we've already talked about - the failure of most new members to use the search feature before asking the same question that has been asked over and over again.

They even added a small “welcome basket” with loccal treats, and guests loved the personal touch.. it became one of their most mentioned features in reviews!

The real estate investing industry uses "Classes" to rank property performance risk, but there's NO agreed upon industry model:(Here's what we use for our Metro Detroit market:Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

What do contractors typically charge to come out to a potential property and walk through and fill out a SOW with pricing?    

I was never interested in that feature so I don't know if my custodian offers it or not.

We typically pay somewhere in the range of $3500 for a new, basic furnance, including install, if there are no other modifications to the system required.