The question that you need to ask is what is the 10% increase that is allowed based on? 

Increase earnings, reduce expenses, save up, and invest.

Code enforcement in Coronado is stricter than the rest of the city, and it does fall under the coastal commission jurisdiction.Depending on the parameters of the flip you can safely factor for an increase in your timeline for permitting of about 30 days. 

You haven't seen it, but you know automatically that that you can increase the rent by $25K a year?   

When the ROE is significantly smaller than my CoC return (based on initial investment) I know it's time to make a move to increase the velocity of the money.

The right renovation will increase your cash flow and reduce maintenance costs.What to Renovate?

In the meantime learn and figure out how to increase income/savings.

For investors, this can mean boosting rental income or increasing the property value significantly.

Remember, investing 200,000 into an ADU won't likely increase your properties value by 200,000, but the rent potential is a great bonus.

But ...The first thing I observed was the replacement cost portion of the quote, was, IMO, less than what it will actually cost to demolish the remains of the existing structure, pay for any hazardous waste removal following a catastrophic loss, and actually pay to replace the property in the event of a total loss, even though I used the quote feature to increase the replacement cost value by 20% (the maximum it would allow).