Must have solar, ev charger etc.My materials distributors are expecting more inflation.Homeowners insurance is still going up.I wholly expect CA residents to continue to move there (wished I'd bought there!

I have a lot of extra materials from the first renovation.

I have just started in a 3-day training for the Lee Arnold broker certification program and thus far just completed the online material required for preparation. 

It's always better to check with your brother's CPA since he has all the background, but I would say short-term rental with material participation requirements met by your brother, then do cost segregation.

Once I sell that I’m gonna convert to a fourplex and do the ADU.going through cash quickly and also using credit cards when possible like to purchase materials.

Maybe an investor is flipping a lot of properties and you could offer to pick up and deliver materials to his crews, clean the work sites every night, bring his crew lunch, or whatever.Find a way to make yourself useful to them, and they will reciprocate.

I believe in this so strongly that I have even once confronted a large advertising client about this issue when I discovered they had language to this effect in their terms of use in the past, and asked them to change their policy, at risk of material revenue loss to our company.

Materials will be about the same, but labor may vary greatly on location.

If you're still interested, take a trip to the site once ground has been broken.The flashy marketing material for a new development is great, but don't put your money at risk for something that's likely to vaporize.

However, the tax treatment differs between short-term and long-term rentals:Short-Term Rentals (STRs): If you materially participate (work 100+ hours and more than anyone else on the property), you may be able to offset rental deductions against W-2 or other active income, offering greater tax benefits.Long-Term Rentals (LTRs): If your AGI exceeds $100K, your rental losses may be limited, unless you qualify as a Real Estate Professional (REPS).If you plan to expand your rental portfolio, consider an LLC later for liability protection and easier management.