@Jimmy Johnson rentometer is pretty good as long as you know it lumps together duplexes, luxury apartments, SFR's etc. make sure to only compare the comps that are like to the building you have. 

We are quite advanced in the process but would appreciate feedback on the LTC targets for similar builds and whether any of our numbers might be overstated or overlooked.Thank you!  

BiggerPockets has a section just for this, Under the BUILD YOUR TEAM tab- Meetupshttps://www.biggerpockets.com/...Best of luck to you!

Property currently has a residential building that we run our business out of, is a STR for the events, and sell parking also for the events. 

So rentability is a factor for investment as well has potential to build good equity.

My goals with REI is to generate as much cashflow and appreciation as possible, so I can get out of the 9-5 routine, build wealth for my future, and have as much time for myself as possible.Is Southern California a tough market for beginners?

My church has a 100+ year old building (original church)  that is on less than 2 acres which includes a cemetery across the street from our current building located in JeffersonCounty,  MO. 

Your goal should be to break even or come close in the first year, then let inflation work in your favor for rental renewals and building equity.

The key is buying properties significantly below market value, keeping costs low through self-management and maintenance skills, and taking a long-term view to build wealth through forced appreciation and equity capture over time.

If we purchases a home as an investment property, build a DADU, and sell the home and DADU (around 12 months after the purchase), what's the best strategy for tax saving?