I was thinking of starting a rent increase for my 1 bedroom tenant voucher due it being low and well under fair market value(Based on  hud and zip code) but my tenant is in the process of having a caretaker for her disability and getting approved for a two bedroom voucher.

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.

Where can I get code violations for St. 

.: In CA it is a violation of CSLB business and professions code 7159(d)(5) to execute residential time and materials contracts.

The FMR in that zip code for 3 BR units is $1,590.Thank you!

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.

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.

I'd argue that there are very select zip codes where this strategy works.

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