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.

It can simplify end-of-year paperwork, but you’ll want to confirm the details with a tax pro.3.Long-Term Game PlanPaying out of pocket and keeping your medical receipts can be a great strategy.

A little details about my situation. 

Glad to share my experience and information if anyone is interested.Interested in some more details 

Have every detail spelled out, use an escrow account and daily updates verifying all parties are executing their responsibilities.

Hi Dominic, thanks for the detailed response.

I used to provide detailed answers to DMs, which are private and help only the requester.

Adding to Trevor's step 5 -  create a detailed SOW. 

And the passive loss rules may prevent you from getting a tax benefit if your rental deductions are more than your rental income for all of these options.David OrrTax Modern

Withoutknowing the details I can not suggest which would be right to add on.Several you should pay attention to are:- Ordinance & Law: Provides additional building coverage to deal with rebuilding costIncreases due to changes in Zoning or Building laws- Personal Injury Liability: Libel, defamation of character, wrongful imprisonment, etc.