Cost Segregation on a 20-Unit Apartment Building: What the Study Finds

Twenty units is the size where cost segregation stops being a judgment call. Depreciable basis at this scale is typically $2 million to $4 million, study fees run $6,500 to $11,000, and reclassified basis lands somewhere between $500,000 and $1,100,000. Nobody has to run a breakeven analysis.

The interesting question at twenty units is not whether to do the study. It is what a good study finds that a cheap one misses, and the answer is almost always common area assets and site work.

The Twenty-Unit Component Profile

Twenty units means twenty appliance packages, twenty sets of cabinetry and countertops, roughly 16,000 to 22,000 square feet of finish flooring, and twenty units worth of decorative lighting and window treatments. Under IRC Sec. 168(e)(3)(B) these are five-year property, and the in-unit total alone typically runs 9% to 13% of depreciable basis.

What separates a twenty-unit from a five-unit is that common areas become substantial. A twenty-unit property usually has a laundry room, a small leasing or management office, mailroom casework, corridor carpet and lighting, and often a fitness room or clubhouse. Laundry equipment, office furniture, and specialty lighting are five-year or seven-year property. Corridor carpet is five-year. These items are individually small and collectively meaningful.

The fifteen-year land improvement category under Sec. 168(e)(3)(C) is where twenty-unit properties diverge most sharply from smaller buildings. You now have a striped parking field, sometimes carports, site lighting on poles with dedicated circuits, a dumpster enclosure, perimeter fencing, sidewalks, landscaping and irrigation, storm drainage with catch basins, and possibly a pool deck or playground. On a garden-style twenty-unit, land improvements commonly reach 12% to 16% of basis.

Expected Reclassification: 24% to 30%

Garden-style twenty-unit properties with surface parking and outdoor amenities cluster at 27% to 30%. Mid-rise twenty-unit buildings on urban lots with structured or tuck-under parking land at 22% to 25%, because the parking structure is generally part of the building rather than a land improvement.

A 1970s value-add property purchased before renovation will show lower reclassification at acquisition and then a second, larger opportunity when the renovation is placed in service. Renovation dollars concentrate heavily in five-year categories: flooring, cabinets, appliances, fixtures, and finishes. It is common for the renovation study to reclassify 35% to 45% of renovation cost even though the acquisition study reclassified 26%.

Worked Example

An investor buys a 1998-vintage twenty-unit garden apartment for $3,400,000. The land allocation is $600,000, leaving $2,800,000 depreciable. The study identifies $322,000 of five-year property (11.5%), $28,000 of seven-year property (1%), and $420,000 of fifteen-year land improvements (15%). Total reclassified basis is $770,000, or 27.5%.

The remaining $2,030,000 depreciates over 27.5 years, contributing roughly $73,800 in year one. The $770,000 of reclassified basis is fully deductible in year one under IRC Sec. 168(k). First-year depreciation totals approximately $843,800.

Without the study, first-year depreciation on $2,800,000 over 27.5 years is about $101,800. The study produced $742,000 of additional first-year deduction. At a 37% marginal rate that is roughly $274,500 of tax deferred, against a study fee near $9,000.

The Assets Cheap Studies Miss

Two categories account for most of the gap between a $3,000 desktop study and a proper engineering-based study on a twenty-unit property.

The first is dedicated electrical and plumbing. Under the functional analysis reflected in Treas. Reg. Sec. 1.48-1(e)(2), branch wiring and piping that exclusively serves five-year equipment is itself five-year property. The dedicated 240-volt circuits serving in-unit dryers, the electrical serving the laundry room equipment, and the supply and waste lines serving appliances are frequently left in the structural bucket by studies that never look at the electrical drawings.

The second is site work detail. A study that lumps everything outside the building into a single land improvement line usually undercounts. Site lighting circuits, irrigation controllers, the dumpster enclosure slab, and signage foundations each have their own treatment. Our guide to evaluating a cost segregation study lists the specific line items to check for.

Passive Loss Planning at Twenty Units

A $742,000 additional deduction is only useful if you can deploy it. Under IRC Sec. 469 a twenty-unit rental is passive to a non-real-estate-professional owner. Most twenty-unit buyers at this level either qualify under Sec. 469(c)(7) or hold the property inside a portfolio that generates offsetting passive income.

If the property is syndicated, the deduction flows to limited partners on their K-1s as passive loss, useful against other passive income and suspended otherwise. The treatment of these allocations is covered in our post on how cost segregation affects syndication K-1s.

Owners should also model the recapture consequence. Roughly $322,000 of the reclassified basis is Sec. 1245 property, which recaptures as ordinary income at disposition. The fifteen-year land improvements recapture under Sec. 1250 rules at a maximum 25% rate on the straight-line portion.

Frequently Asked Questions

How much does a 20-unit cost segregation study cost?

Typically $6,500 to $11,000 for a full engineering-based study with site inspection. At a reclassification of $700,000 or more producing $250,000 or more in first-year tax deferral, the fee is a rounding error against the benefit.

Should I do the study at purchase or after renovation?

Both, if you are doing a value-add. The acquisition study captures the as-purchased components, and a second study on the renovation typically reclassifies 35% to 45% of renovation cost because renovation dollars concentrate in flooring, cabinets, appliances, and fixtures.

Do carports and parking lots count as land improvements?

Surface parking, carports, striping, curbing, and site lighting are 15-year land improvements under IRC Sec. 168(e)(3)(C). Structured or tuck-under parking that is integral to the building is generally treated as part of the 27.5-year structure instead.

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