., 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.

I was never interested in that feature so I don't know if my custodian offers it or not.

Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

@Joe Gellenbeck Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a Class A property in Class D area, what quality of tenant will you get?

The reality is the land has value.I believe you are typically far better purchasing a different property with conventional financing than adding an ADU.  

In the assets I am considering - the seller is typically selling because they no longer have the time or energy. 

Britt,My firm has evaluated some smaller properties (under $500k) in the past for cost segregation, and it generally does not cost justify moving forward, since the benefits are small, and typically the tax liability on the income is minimal if any.

You won't be able to use conventional financing and must use a non-recourse loan which typically require 40% down.

The capital stack especially in CA is VERY complex and typically involves everything and more that you mentioned.

That sort of thing is typically negotiable.