After going through multiple post on this topic, If I summarize, some people are saying that it is necessary to have it under LLC and some don’t.

My friend Keith summarized it this way:Appreciation.

Typical investor presentations typically start with the projected overall returns, which almost any model will provide (in fact that is effectively the whole reason they exist), and often a hold period summarized pro forma, to show a bit more of the details that flow into your returns.Again, I think you should hit up Adventures in CRE.  

To summarize, these homes will contain a ground level space that's called out as "office space" on the zoning permit and other pertinent facts include the SF which totals 3,100 SF with 250 SF of the total SF of that space attributed to the "commercial space" and estimated price point of $1.1M for each home.

The broad term for these things is “sources.”And, usually, once you’ve done the research, you present or summarize it in some way.

To summarize, if you have appropriate insurance, possess a good vendor contract you require your service providers to sign and obtain their insurance certificates with you listed as a certificate holder, you are taking the necessary steps to protect yourself.

Can you summarize the basics for LA?

To summarize: I can't say anything for certain without knowing details about your specific situation.

If you are worried it could be worth sending an email summarizing what you've seen, and referencing that section of the lease and reminding them that if the furnace goes out due to their miss-use and abuse of the system then they are liable for the replacement. 

To summarize you have 3 main options with some flexibility to mix and match.Figure out the returns (and karma) of having good stable tenants and figure out if the 450/mo you are missing out on is worth no turnover, low maintenance, on time payments and good tenants over the next 7+years or so ( you didn’t tell us their ages).