These allow you to bundle renovation costs, and if the post-renovation value meets 20% equity, you may be able to avoid PMI.

Given your experience and strong financials, you have some solid options:Commercial or Portfolio Loan: These are tailored for investors and can help you avoid personal guarantees, especially since you have an LLC.BRRRR Loan (Buy, Rehab, Rent, Refinance, Repeat): Some lenders offer BRRRR-specific loans with funding for purchase and rehab, allowing you to refinance based on the new ARV once stabilized.HELOC or Cash-Out Refi on Current Rentals: Tap into the equity on your single-family rentals to secure funding for the 4-plex purchase and rehab without high origination fees.Each has pros depending on your cash flow goals and timeline.

I assume it's typically best (if it's necessary to do so and if the budget allows) to re-level the home before the floors are installed. 

Or any clues on the document that would allow me to spot any major problem, such as foundation, electrical, plumbing etc.?

PadSplit is not passive but it has been a mostly positive experience for me.His numbers seem realistic except PadSplit fees are typically 14.75% (not 14.25%)which is a 12% platform fee and a 2.75% stripe fee to allow members to pay their rent w a credit card. 

I would say credit partnership meaning that someone allows me to use their qualifying credit to qualify for financing at the same time they are an equity partner on the deal who I split profits with? 

The best bet is to ask a local landlord attorney what is and isn't allowed in your area. 

I blame the politicians that create rules that allow this.   

Meeting these requirements could allow you to offset W-2 income with deductions like bonus depreciation and cost segregation.

First good old politicking, find all of the other owners who can vote and see if they will agree to vote with you to allow STR or even to amend the bylays.