With all the issues with the promo is making me doubt.

Key Details of the 45L Tax Credit:The credit offers up to $2,000 per eligible unit for builders and developers of residential homes that meet specific energy efficiency criteria.To qualify, the units need to meet or exceed certain energy performance levels in comparison to the national model energy code (e.g., the 2006 or 2009 IECC — International Energy Conservation Code).Cost Considerations for a 90-unit or 112-unit Project:The actual cost of qualifying for the 45L tax credit depends on various factors, including:Energy Efficiency Compliance: The primary cost will come from ensuring that each unit meets the required energy efficiency standards, which typically involve energy modeling, certification from third-party energy raters, and potentially upgrading insulation, HVAC systems, windows, and other components of the building to meet the necessary performance levels.Energy Modeling: Typically, you'll need to pay for an energy consultant or engineer to model the building's energy performance and ensure it qualifies for the credit.

When I asked if someone had an affiliate code (so I could give them credit), they didn't.

- A list of ZIP codes that are classified as label B areas? 

It sounds like you have an un-permitted unit, which is essentially always a risk since there has been no notice to the AHJ that it exists and they can therefore initiate a code case to have it removed in most cases.

Check out this table: https://www.municode.com/library/ca/oakland/codes/...This is what you're looking for: https://www.screencast.com/t/Xkyp3OZWkI Oakland, for a building with 3 units or more you need to have a lot sized at 7,500 sq ft.  --- From the zoning code it says, an RM-2 zoned lot can have "1 unit per 2,500 sf. of lot area"If you don't meet that lot size requirement you'll need to make a request for a variance, then post notice about the desired change in front of the building.

My question is why you want to bring it up to code, other than just to feel good or improve your exit strategy?

Then add any other codes required where you want to build and study those as well.

There are an extreme amount of silly codes out there that obviously have nothing to do with safety.

•Are there any specific neighborhoods or zip codes to target or avoid?