A data center inverts the usual ratio. In most commercial buildings the shell carries the value and the equipment is the exception; here the electrical and mechanical infrastructure serving the IT load is the asset, and the building is largely a weatherproof box built to protect it. That is why the accelerated share sits so far above every other type we publish.
The signature fact: the power and cooling chain exists to serve computing equipment, not to serve the building, and that purpose is what drives the classification. A UPS, its distribution and the cooling that removes the heat it produces are all serving identifiable equipment. The house panel, the office HVAC and the roof are serving the building. In a facility where the first group is most of the construction cost, the accelerated share is high for a real reason rather than an aggressive one.
Range for data centers
Our quality-control envelope for data centers runs 38–60%, which is where a study gets flagged for review outside. We do not publish a single modeled central for this type, and that is deliberate: a data center is scoped by proposal with engineer review rather than produced from a standard template, because the density, redundancy tier and whether the shell is owned or leased move the answer more than any building-level average could capture.
| Facility profile | Where studies tend to land |
|---|---|
| Enterprise room or small colocation suite inside a conventional building | Lower end, driven by the tenant improvement rather than the shell |
| Purpose-built single-tenant facility | Middle of the envelope |
| High-density, high-redundancy build with heavy electrical infrastructure | Upper end |
What reclassifies in a data center
5-year personal property (Section 1245)
- UPS systems, batteries, static switches and their dedicated distribution
- Power distribution units, remote power panels, busway and whips serving racks
- Switchgear and paralleling gear serving the IT load, and the generators and fuel systems backing it
- CRAC and CRAH units, in-row cooling, containment systems, condensers and dedicated chillers serving the white space
- Raised access flooring and the underfloor distribution it exists to carry
- Structured cabling, cross-connects, cable tray and pathway serving IT
- Building management, DCIM, monitoring, leak detection and environmental sensing
- Security: access control, CCTV, biometric readers and mantrap equipment
7-year specialty (Section 1245)
- Specialty racking, cabinets and equipment enclosures that function as furniture rather than structure
15-year land improvements (Section 1250)
- Site paving, security fencing, bollards, vehicle barriers and gates
- Generator yards, fuel-tank pads and their enclosures, site lighting, drainage and landscaping
39-year structural (Section 1250)
- Shell, roof, slab, structural steel and hardened envelope
- Base building HVAC serving offices and support space
- House electrical service, general lighting and the building’s own life-safety systems
- Restrooms, offices, loading and standard finishes
Two lines that need an engineer, not a rule
Fire suppression. Ordinary building sprinklers are structural. Clean-agent systems installed to protect equipment are argued on their purpose, and the two frequently coexist in one facility. The answer comes from what each system protects, which means someone has to read the fire-protection drawings.
Cooling that serves both. A chiller plant that conditions white space and offices from the same equipment is a split, not a single classification. The mechanical schedule and the load calculations decide the allocation, and the study should show the basis it used.
How Cost Seg Smart handles this type
Data centers are scoped individually and priced by proposal rather than run from a standard property template. We say that plainly because the honest description of this category is that specialized national engineering firms carry the deepest documented data-center work, and a buyer choosing on evidence should know it. Our related published work is on crypto mining facilities, which share the power-and-cooling profile at a different scale, and a sample report is available for inspection before you engage anyone.
FAQ
Why is the accelerated share so much higher than other commercial property?
Because the construction cost is concentrated in power and cooling infrastructure that serves computing equipment rather than the building. The classification follows the purpose of the system, and in a data center most of the money is in systems whose purpose is the IT load.
Is raised flooring 5-year property?
It is usually argued as equipment support rather than building structure, because it exists to carry power and cooling distribution to the racks. It is a contested line, so the study should state the basis rather than assert the conclusion, and the facts of the installation matter.
We lease our space in a colocation facility. Is there anything to study?
Possibly, if you paid for the fit-out. What you would be studying is your own improvement, not the landlord’s building, and the electrical and cooling equipment you funded is where the value sits. The lease and any improvement allowance settle who paid for what, and that comes first.
Does the generator qualify?
Where it exists to back the IT load it follows that load. Where it exists to keep life-safety systems running it is building property. Large facilities often have both, and the one-line answer is that it depends on what the generator is wired to serve.