Big box is the simplest shell in commercial retail sitting on one of the largest parking fields. That combination sets both the ceiling and the floor of the study: not much reclassifies inside, a great deal reclassifies outside.
The signature fact: a big box building is deliberately cheap per square foot and deliberately generic, because the tenant’s fit-out does the differentiating. So the accelerated share is driven by site work and by display-level finishes rather than by building systems. Where the box is grocery-anchored the picture changes materially, because refrigeration is equipment and it is expensive.
What reclassifies in big box retail
5-year personal property (Section 1245)
- Display, accent and decorative lighting distinct from general sales-floor lighting
- Vestibule and entry finishes, interior millwork and specialty fixtures
- Refrigeration cases, walk-ins and their dedicated services where the box is grocery-anchored
- Interior signage, department wayfinding, security, CCTV and access control
- Point-of-sale and back-office IT infrastructure, checkout millwork functioning as fixtures
- Garden-center and seasonal-area equipment, dedicated power to specialty departments
15-year land improvements (Section 1250)
- The parking field: paving, striping, curbing, islands, cart corrals and bollards
- Site and parking lighting, poles and bases
- Pylon and monument signage structures, sidewalks, hardscape and trash enclosures
- Landscaping, irrigation, storm drainage and detention
39-year structural (Section 1250)
- Shell, roof, structural framing, storefront framing and glazing
- Base HVAC serving the sales floor, building electrical service and general lighting
- Fire protection, loading dock structure, restrooms and standard finishes
Where the range actually comes from
The published range is wide because “big box” covers a dry-goods box and a grocery-anchored box, and they are different studies. A dry box lands low: simple shell, parking, signage. A grocery-anchored box lands high, because refrigeration cases and their dedicated electrical are equipment and often represent a large share of the fit-out. If you are comparing quotes between firms, ask which of those two buildings the estimate assumed.
Illustrative, modeled
On a $16M big box property with roughly $13M of depreciable basis and six acres of parking, an accelerated share near 18% moves about $2.3M into short-life pools; grocery-anchored, the same building can move meaningfully more. These are modeled figures rather than completed client studies.
Cost Seg Smart produces big box studies on the retail component library with engineer review of the site work and any refrigeration. Fees are published at costsegsmart.com.
FAQ
Is the storefront glazing 5-year property?
No. Structural storefront framing and glazing are part of the building. Display fixtures, window treatments and the lighting used to merchandise the window are evaluated separately, and those can qualify.
The tenant is a national retailer who built out the interior. What do I own?
Typically the shell, the site and whatever the lease assigns to you. National retail leases are usually explicit about it, which makes this one of the easier property types to establish ownership boundaries in, provided someone reads the lease before the study rather than after.
Does a dark box still get studied?
Yes, on what exists and what was placed in service. Vacancy affects placed-in-service and, in some cases, whether a deduction is currently usable, both of which are CPA questions rather than engineering ones.