Varies based on contractors, location, permitted vs. un-permitted.

Because the answers to these questions are site-dependent, you'll need to check with your local zoning and permit departments. 

You might have to get an architect and pull permits for the work your describing.Eric

QOZ property includes interests held by the QOF in a Qualified Opportunity Zone Business (“QOZB”)An investor has 6 months from the sale of a property to invest, and the rules permit actual receipt of the sale proceeds.

Pulling permits, hiring licensed contractors, being someone anal about the carpenters/cabinet installer/tiler/painters work.  

Got permitting done to turn it into 3 units and it’s now cash flowing every month $2.5K.

When it comes to refinance, you either will have to secure the appropriate zoning or obtain a special use permit to comply with local ordinances.

I am interested in establishing a Short-Term Rental (STR) in Oceanside and noticed on the City website that STRs are permitted only in the Coastal area.

And if you have multiple series inside the LLC you will not be permitted to use the name of the LLC on subsequent applications for additional series.

Of course, there are a lot of things to look out for...setting up an appropriate contingency reserve for unexpecteds, getting an accurate scope of work, properly knowing what your time-value-of-money costs are going to be, making sure you're contractor is not pulling crews for other customers, knowing codes and getting your permitting right, and the list goes on.