I am also using the BRRRR strategy. 

Are there sensible steps I should be taking at this moment?

I do have a handful of clients that have ended up using multiple CPAs just due to who their partners were on different deals, and even in those cases they almost always end up consolidating to a single CPA - taxes are enough of a headache without dealing with 3 different professionals who each only have a slice of the whole picture.If you are going to regularly be investing across the country, it doesn't hurt to work with a firm that has State and Local Tax (often referred to as "SALT") internal resources, though typically this does come from larger firms with larger fees. 

Is this a super high-end build?

I am a new multifamily investor (5-20 units) along the Front Range specifically Boulder and Jefferson Counties and am having the same issues when it comes to getting quotes.Brokers and agents have told me that some areas near us are simply uninsurable now.Most owners that I meet have are still in policies from before the fire.What have you learned in the two months since posting this?

This should include which areas you can access, what hours you can work, and any safety measures you’ll take.

If so, what would be the best way to advertise this type pf setup?

I have been working with a realtor in the past (when I bought my first property) who does not seem interested in this type of sale.

This def appeals to me :) stick to my plan.

May I know what lender or banks for HELOC do you use for home equity line of credit or equity line of credit on rental properties?