Main thing for you is: - Have both you and your buddy talk to the same lender and get pre-approved to understand down payment options and what your combined budget would be- Decide how you want title held (joint tenancy or tenants in common) - do a google search on this to see which option is best for you guys- START SHOPPING!

You technically need to be registered in the state where you will be utilizing the legal system.

Just get legal help next time. 

Alternatively, can I get pre-approved online or with my bank and go from there before shopping between lenders? 

Part of the reason for this is that this past year was a tough year for my Dad, as he lost his father, and there was an unfortunate legal battle (which has since calmed down), with an unfortunately uncommunicative sibling in charge of the estate. 

Someone questions my integrity on Bigger Pockets and I get legals to "pepper" them with letters?

I’d appreciate some feedback on my current approach and advice if any.Here’s what I’ve done so far:Pre-Approval: I’ve secured a pre-approval amount and interest rate from an online mortgage lender.Property Analysis: I’m using the mortgage and STR calculators from BiggerPockets to assess the financials for potential properties.Neighborhood Research: I’ve been exploring different neighborhoods using Niche to get insights into schools, safety, and livability.AirDNA: I’m considering subscribing to AirDNA for data on occupancy rates and rental income estimates.Questions:Is AirDNA worth the investment for STR data?

*NOT LEGAL ADVICE* 10 diff LLCs is probably not necessary.

I have gotten lender name changes approved on prior deals.  

Many people are suggesting to do a 1031 but have no idea what your gain / tax is(if any).Co-ops in the tri-state area 'normally' don't appreciate a crazy amount.The main reasons is the high monthly maintenance costs, over-leverage of the board, potential difficulty of buyers getting a mortgage and the approval process of the buyer.With that said, talk to your CPA to discuss what your gain / tax would be before thinking about a 1031 exchange.If your tax burden is low, don't bother with the 1031It may be possible that you have suspended passive losses to cover your tax burden.best of luck.