Office-to-Residential Conversions: South Africa’s Adaptive-Reuse Play Gathers Pace in 2026

Market Analysis

JOHANNESBURG / CAPE TOWN — 18 JUNE 2026

South Africa’s office market is staging its clearest recovery since the pandemic — but the rebound is splitting sharply along regional lines, and the most striking response to years of oversupply is happening off the leasing market entirely. Developers are buying up emptied office blocks to turn them into apartments. According to the FNB Commercial Property Broker Survey, nearly one in five office purchases nationally is now aimed at residential or mixed-use conversion — and the overwhelming share of that activity is concentrated in a single metro.

For investors, the headline “office recovery” hides two very different stories. The coastal metros are recovering through demand. Gauteng is recovering, in large part, by repurposing the buildings nobody wants to lease. Understanding which is which is the difference between a sound entry and a stranded asset.

A recovery — but a two-speed one

Office sales activity strengthened through 2025, with FNB’s Senior Property Economist for Commercial Property Finance, John Loos, describing 2025 as a stronger year for property sales activity than 2024. The national office vacancy rate, which peaked at 18.2% in 2021/22 on MSCI data, eased to 15.8% by 2024. Separate Rode data tracking A+, A and B-grade space shows vacancies falling from roughly 18% in the first half of 2022 to 12.8% by the first quarter of 2025 — still well above the long-term average of around 9.5%, but a clear improvement.

The regional divergence is the part investors should not skim past. The Western Cape and KwaZulu-Natal coastal markets are recovering on genuine demand — decentralised Cape Town and Durban vacancies sit above 8%, supported in part by call-centre and business-services take-up. Gauteng remains under far heavier pressure, with first-quarter 2025 office vacancies of around 14.1% in Johannesburg and 13.4% in Pretoria. On the ground, Heartwood Properties CEO John Whall has reported a firm start to 2026 for Cape Town warehouse and office enquiries, while flagging the perennial constraint: a shortage of zoned, serviced land for new development.

The conversion play is a Johannesburg story

When FNB asked brokers why buyers were acquiring office property in its first- and second-quarter 2025 surveys, the breakdown was telling: 43% were buying for their own use, 36.4% were investors, and 19.3% were acquiring offices specifically to convert them to residential or mixed-use. That national average, however, masks an enormous regional skew. Johannesburg recorded conversion intent of 38.1% — by a wide margin the highest in the country — followed by Nelson Mandela Bay at 17.1% and Tshwane at 14.9%. Cape Town registered just 4.6%, and eThekwini a marginal 1.3%.

The logic is straightforward once the vacancy picture is in view. Conversion is a release valve for oversupply, and Gauteng has the most office space it can no longer fill. The coastal metros, with healthier leasing fundamentals, simply have less need to repurpose. As of the second quarter of 2025, around 57% of brokers still felt office supply exceeded demand — a high number, but a dramatic fall from the record 98.4% recorded in the second quarter of 2021. The collapse in new office development has done much of the rest of the work.

What actually makes a conversion work

Adaptive reuse looks elegant on paper and punishes the careless in practice. The economics hinge on buying at a sufficient discount per square metre to absorb conversion costs — and those costs are rarely trivial. Office services such as electrical and plumbing reticulation are built for open floors, not dozens of individual dwellings, so splitting a floor plate into apartments means running new services to every unit. The floor plate itself can be the dealbreaker: too many structural columns, or lift cores in the wrong place, can render a building uneconomic to convert at all.

The buildings that pencil out tend to share a profile: high efficiency ratios, generous existing power and water capacity, and — critically — zoning and services already in place, which spares a developer the holding costs and delays of rezoning from commercial to residential. For investors screening opportunities, that checklist is the due-diligence baseline. A cheap office block is not a cheap apartment building until an engineer and a town planner have confirmed it can become one.

Snapshot: the conversion map

*Share of office-property buyers acquiring with intent to convert to residential or mixed-use. Source: FNB Commercial Property Broker Survey, Q1–Q2 2025 (aggregated). Vacancy data: MSCI, Rode, FNB.

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