Cost segregation for CBD high-rise office towers
A downtown tower is a structure-heavy asset: the frame, core, and vertical transportation are the building, and they are all 39-year. That geometry sets a lower ceiling than a sprawling suburban office — there is almost no site work to reclassify. The 10–24% modeled range comes from tenant-floor finishes and the mechanical and low-voltage systems that serve occupants rather than the base building.
| Modeled reclass range | 10–24% |
|---|---|
| Typical study fee (Cost Seg Smart) | See pricing guide |
| Recovery periods captured | 5-, 7- and 15-year vs the 39-year shell |
| Delivery | Engineering-based; virtual or on-site depending on the provider |
1What reclassifies in a CBD high-rise office towers
Cost segregation moves qualifying components out of the 39-year building shell into shorter recovery periods. In a office (cbd high-rise) the recurring short-life components are:
| Component | Recovery period | Authority carried (with caveat) |
|---|---|---|
| Tenant-improvement finishes — floor-by-floor carpet, ceilings, partitions, millwork | 5- or 15-year | Tenant-specific finishes may qualify depending on whether they are removable and not part of the building's structural or operational systems. |
| Supplemental & tenant HVAC — fan-powered boxes, tenant condenser water taps, floor-level VAV serving specific loads | 5-year | Conditioning dedicated to a tenant's equipment or space rather than base-building comfort may qualify depending on its function. |
| Low-voltage, security & access control — riser cabling, card readers, floor CCTV | 5-year | Systems serving occupant security and communications may be §1245 depending on whether they are dedicated to tenants versus base-building life-safety. |
| Lobby & elevator-cab finishes — stone cladding, decorative cab interiors, feature ceilings | 5- or 39-year | Decorative finish layers may qualify while the structural and code-required elements stay 39-year; the split requires engineer review of what is finish versus structure. |
| Window-washing rigging & davits — roof-mounted maintenance equipment | 5-year | Building-service equipment may be treated as §1245 depending on whether it is machinery serving operations rather than a structural component. |
| Branding & signage — lobby identification, tenant directory systems | 5-year | Decorative and tenant-identification signage may qualify depending on installation and permanence. |
2Typical results and what drives the spread
Across standardized office (cbd high-rise) configurations, the engine models an accelerated share of roughly 10–24%. Position inside the 10–24% modeled range tracks how much of the tower is finished tenant space versus core, shell, and vertical transportation. These are modeled ranges, not a promise for any specific building — see by the numbers.
3By the numbers (original data)
4What a study costs for this type
Study fees track building size, documentation quality and whether an on-site inspection is performed. See the pricing guide for current market bands; competitor fees are sourced there, not quoted in prose here.
5Provider comparison — the Top 5 for this asset class
Every provider below is scored on the same fixed rubric, weighting relevant office (cbd high-rise) evidence most heavily. Facts are drawn from each provider's public materials and dated.
| Provider | Score* | Relevant office (cbd high-rise) evidence | Profile | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RE Cost Seg Engineering-first · National (Houston, TX) Best published pricing Best for virtual delivery Most transparent turnaround | 7.9How this score is built (sub-score ÷ 5 × weight):
| Generic coverage only source · as of Jul 2026 | Profile → | ||||||||||||||||||||||||||||||||
| Cost Seg Smart site owner Engineering-first Best published pricing Best for virtual delivery | 7.8How this score is built (sub-score ÷ 5 × weight):
| Generic coverage only source · as of Jul 2026 | Profile → | ||||||||||||||||||||||||||||||||
| Baker Tilly National accounting/advisory · National (Chicago, IL) Best for national on-site coverage Most transparent turnaround | 7.6How this score is built (sub-score ÷ 5 × weight):
| Generic coverage only source · as of Jul 2026 | Profile → | ||||||||||||||||||||||||||||||||
| Source Advisors Engineering-first · National (Fort Worth, TX) Best for national on-site coverage | 7.3How this score is built (sub-score ÷ 5 × weight):
| Generic coverage only source · as of Jul 2026 | Profile → | ||||||||||||||||||||||||||||||||
| Cherry Bekaert Engineering-first · National (Richmond, VA; #1 Southeast) Best for national on-site coverage | 7.2How this score is built (sub-score ÷ 5 × weight):
| Generic coverage only source · as of Jul 2026 | Profile → |
Top 5 of 22 firms scored for office (cbd high-rise). See every firm's full profile and per-type standing in the provider directory.
*Score is this site's published rubric output (0–10) for office (cbd high-rise), weighting relevant property-type evidence most heavily (see how we compare) — click any score for its build-up. It is not a customer rating and no reviews are used. Cost Seg Smart is the site owner and is scored on the same rubric.
6Is it worth it — break-even
Given the large absolute basis of a tower, even a lower-percentage reclass is a large dollar figure, so a study generally pays for itself well before the percentage would suggest — particularly where bonus depreciation still applies to the eligible short-life basis.
7Frequently asked questions
Why is the reclass ceiling lower for a tower than for a suburban office?
A tower spends its money on structure and vertical transportation — the frame, core, and elevators — all of which are 39-year, and it has almost no site work to reclassify. A suburban office spreads cost into parking, landscaping, and grade-level systems that carry shorter lives, lifting its ceiling.
Are the elevators ever short-life property?
Generally no. Elevators are treated as building components on a 39-year life. Only certain associated systems or finishes might be examined separately, and only where the facts support it — the lifting equipment itself stays long-life.
The lobby has expensive stone and custom cab interiors — does that help?
The decorative finish layer may qualify, but the structural and code-required portions stay 39-year. An engineer separates the removable or purely decorative finish from the building element, so only the defensible slice is reclassified.
Does a large absolute basis make a study more worthwhile even at a lower percentage?
Yes. On a tower, a modest percentage applied to a very large basis is still a substantial short-life figure. The dollar outcome, not the headline percentage, is what determines whether the study pays off.
We only own certain floors as a condo interest — can we still segregate?
Generally yes, against the basis you own. The analysis focuses on your floors' finishes and dedicated systems plus your allocated share of common elements, with classification depending on the specific ownership and installation facts.
Sources and authority consulted
- Rev. Proc. 87-56 (MACRS asset classes)
- IRS Cost Segregation Audit Techniques Guide (Pub 5653)
- Cost Seg Smart per-vertical component engine (modeled ranges + component authorities).
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