If they aren't playing ball, walk away.You will need to make sure the home is code compliant.

If the proper reports and documentation are not completed, you run the risk of failing an IRS audit and the cost segregation not being honored.

RemoteLock or August Smart Locks – Essential for remote check-ins; integrates with booking platforms to auto-generate codes. 4.

If you crack the code how to find shortcuts feel free to let me know. :-) 

What seem to be the best zip codes for rentals?  

I recently completed one on a multifamily property and found it to be a cost-effective approach.That said, there are a couple of additional factors to consider beyond the code differences between a garage conversion and new construction:Coastal Overlay Zones – If your property is in a coastal overlay, building a ground-up ADU may require Coastal Commission review, which can add time and complexity to the process.

Some nosy people might even rat me out to the code-compliance folks.

And are you targeting a certain zip code in LR or a certain neighborhood/area/school district?

The marketing/advertising firm, aka RE broker, is not the expert in building codes, zoning, structural engineering, neighborhood safety, etc.As a prudent investor, always do your own due diligence or you'll end up being (unitentionally) misguided by a RE broker's information.  

These are professionals with additional training and a stricter code of ethics.