Thank you for your suggestions!

@Brett Burky suggestion of Rival Brothers is ok but they have a lot of equations that does not really work with note buyers.  

I purchased my first single-family rental last year on LLC and I did the cost segregation study on that property now I talk with my CPA and mention about the cost aggregation study for filing the last year tax return (2024)he said that I don't need to use it because anyway my tax return is going negative because of all the expenses of closing cost insurance HOA and everything so what would you suggest me that use my Cross aggregation study for my tax return or not. thank you in advance for your response .Have you spoken with your cost segregation partner?  

Any suggestions?

your thoughts on Costsegregation? 
Any referrals in So. Cal or Orange County areas .  
I brought a MTR  Condo in Aug.  2024. 

The guest suggested re-visiting this list every three months, or "quarterly".I know that I heard of the idea on a (recent?)

Open to hear alternate suggestions. 

There's a lot of other things to consider here but I'll go through your list and make some suggestions based on 10 years of investing across various asset classes - single family, multifamily, industrial, storage, retail, office, etc. and I've had experience with section 8 housing, BRRRR, flips, etc.Purchasing rental properties?

Looking for suggestions on any specific building materials, fixtures, accessories, furniture, and tech for a STR.  

Im North of Phoenix South of Flagstaff. Do I need to choose a location close to home or farther away? Do I wait to get more cash? Go with auctions? I have preaproval for a 250K loan now. Houses are mostly at least 450...