Generally, this would be ok if you are building at scale and planning to build high quantity of modules, which would eliminate single family homes or ADUs. 

Sufficient capital to fund the marketing campaign resulting in deal flow2.

Can someone confirm if the city's "Housing Rental License" is sufficient to list on Airbnb and VRBO for MTR??

They'd also want an LOE and to see the other holdings in the portfolio to make sure there are sufficient assets for this process to continue for at least three years into the future.

Talk to an attorney, but a good umbrella policy will probably be sufficient for what you're doing (and cheaper). 

Each option has its pros and cons that can impact your investment strategy and overall success.HELOC (Home Equity Line of Credit)Pros:Lower Interest Rates: HELOCs typically offer lower interest rates compared to hard money loans.Flexible Terms: You only pay interest on the amount you draw, providing flexibility in how much you borrow and when.Revolving Credit: As you pay down the principal, the available credit replenishes, allowing you to use it for multiple projects.Longer Repayment Periods: HELOCs often have longer repayment periods, which can make managing payments easier.Cons:Qualification Requirements: HELOCs require good credit and sufficient equity in your primary residence.Secured by Your Home: Your primary residence is collateral, which means a default could risk your home.Variable Interest Rates: HELOCs often have variable rates, which can increase over time.Hard Money LoanPros:Easier Qualification: Hard money lenders focus more on the property’s value and potential rather than your credit score.Speed of Funding: Hard money loans can be approved and funded quickly, which is beneficial in competitive markets.Flexible Use: These loans are designed for real estate investments, making them suitable for purchase and renovation costs.Cons:Higher Interest Rates: Hard money loans typically have higher interest rates and fees compared to HELOCs.Short-Term Loans: They usually come with short repayment terms (often 12-24 months), requiring a quick turnaround on your project.High Fees: Origination fees and other costs can add up, increasing your overall project expenses.For a BRRRR strategy, a HELOC might be the better option if you qualify and have sufficient equity in your primary residence.

Should you decide to proceed with such a transaction, it would be prudent to ensure that sufficient capital reserves are available to mitigate this risk.

So if you're looking at the self sufficiency test that can be tricky!  

once a month is sufficient? 

Set aside enough for a 20% down with sufficient reserves.