§179D energy deduction coordination.

The energy efficiency deduction that stacks on top of cost segregation for value-add MF. We don't run the PE cert in-house — we refer, coordinate, and integrate the result into the basis schedule.

What §179D is and when MF qualifies

§179D is the Energy Efficient Commercial Buildings Deduction, originally enacted in 2005 and substantially expanded by the Inflation Reduction Act of 2022 (effective 2023). The deduction applies to commercial-classified buildings — and for multifamily specifically, qualification depends on building characteristics:

• 4+ story residential buildings — qualify as commercial under §179D irrespective of unit count.
• Multi-tenant residential with commercial common space — clubhouse, leasing office, fitness center; the commercial space qualifies even when the residential units don't.
• Mixed-use MF — buildings with ground-floor retail or office plus upper-floor residential. The commercial floors qualify in full.

The deduction triggers from new construction or substantial renovation that meets ASHRAE 90.1 energy efficiency standards relative to a 2007 reference baseline. The exact qualifying threshold varies by building type and renovation scope, but typical MF renovations (HVAC upgrades, envelope work, LED lighting) cross the threshold when reasonably specified.

The PE certification requirement

§179D specifies that the energy savings claim must be certified by a "qualified individual" — defined as a licensed Professional Engineer or Certified Energy Manager not affiliated with the building owner, who has independently modeled the building's energy performance against the ASHRAE baseline. The PE certifies the deduction in writing; the partnership attaches that certification to the tax return.

Cost segregation is engineering analysis; §179D is also engineering analysis, but a different specialty. The two practices share methodology DNA but require different licensing. Bundling both under one vendor's umbrella creates either over-claiming risk (if the vendor cuts corners on PE cert) or scope creep on the PE side. Most institutional sponsors prefer the cleaner split: cost seg vendor handles the building component reclassification; PE handles the energy modeling.

Our coordination role: refer qualified energy engineers from a vetted bench, manage the timing alignment between the two engagements, and integrate the resulting 179D allocation into the unified basis schedule that goes to the CPA.

$0.50/sqft to $5.00/sqft, by retrofit depth

The §179D deduction scales with energy savings achieved. Three tiers:

EXAMPLE FIGURES BASED ON 142-UNIT, 120K SQFT VENTANA-CLASS MF. ACTUAL DEDUCTION DEPENDS ON ENERGY MODELING, NOT JUST SQFT.

Why §179D and §1245 don't recapture the same way

Cost segregation accelerated buckets (§1245 personal property, §1250 real property) recapture on disposition at ordinary rates (§1245) or at a 25% maximum (§1250). The recapture is on accumulated depreciation, not on the original deduction amount.

§179D works differently. The deduction reduces the building's tax basis dollar-for-dollar in the year claimed. At sale, the reduced basis increases the realized gain — effectively recapturing the §179D deduction as part of the sale gain. The economic effect is similar to §1245 recapture (the deduction is "given back" at sale), but the mechanics are basis-reduction rather than depreciation-recapture, and the partnership tax reporting differs. Exit modeling should treat the §179D layer separately when computing post-sale LP outcomes.