This crude method ignores all the other debt payments tenants have.

is there any other methods which is better than above two ?

I wanted to consider trying this method and wanted to know this:If I borrow money from a lender, go in on a deal with renovations, how can I know if my Refi 6months to a year later will be enough to cover what was borrowed?

Coverage is very good with this method.

Option 1:Pros:Simplicity: You avoid the potential complications of alerting the lender.Maintains Low-Interest Rate: Since your loan is at 3%, you continue benefiting from this favorable rate.Avoids Immediate Full Payment: You won’t be forced to come up with $45k immediately.Cons:Risk of Detection: If the lender identifies the payments coming from an LLC, they might call the loan due.Potential Consequences: If the lender enforces the due on sale clause, you might be forced to pay the remaining loan balance quickly.Option 2:Pros:Transparency: Being upfront might build trust with the lender.Possible Flexibility: Given your solid payment history, the lender might agree to the arrangement.Legal Compliance: You avoid any potential issues with violating the terms of your mortgage agreement.Cons:Risk of Loan Acceleration: The lender could still decide to call the loan due, forcing you to pay the remaining balance.Potential for Higher Payments: If forced to refinance, you might end up with a higher interest rate.Given the pros and cons of each option, but a cautious approach might be best:Consult a Real Estate Attorney: This can give you a clear understanding of your legal standing and potential risks.Evaluate the Importance of the 3% Rate: Weigh the benefits of keeping your low-interest rate against the risks of potentially having to pay off the loan early.Consider a Gradual Transition: This method allows you to continue benefiting from the low-interest rate while reducing the risk of triggering the due on sale clause.

Have you had any success with this method lately?

I am interested in pursuing the BRRRR method, but I am hesitant to take this on due to the "Rehab" portion of the strategy. 

The risk to you is that by selling partial ownership you may be selling a security under the Federal definition and therefore depending on the method used to find investors could be violating Federal or state securities regulations.  

Just trying to scope out ideas / methods to minimize loss here . 

Quote from @Joshua Lee: I've read about house hacking the BRRRR method, FHA loans, etc..