**Müllheimerstrasse 55, 4057 Basel — 3.5-room condominium.** A 84 m² net-living-area apartment on the 2nd floor of a 1975, 6-storey multi-family building in the **Matthäus quarter** (Kleinbasel), a central, lively, well-connected inner-city district near the Rhine, trams and buses.
**Ownership context (from the STWEG documents):** managed by Regimo Basel (new manager Dinvest AG from ~2025/26); the co-owners' association has **planned a phased façade + roof energetic renovation of the whole building — the sum of three staged estimates (roof + PV, rear & front façade) ≈ CHF 500'000–600'000 incl. subsidies, earliest start ~3 years out** (full breakdown in §3), plus an ordered earthquake-safety assessment (~CHF 10'000). Fire-safety upgrades (new flat entrance doors, etc.) were completed in 2024. A ground-floor doctor's practice will be converted to two flats by another owner at that owner's cost.
**One-line take:** an honestly-priced, centrally-located city flat with good bones and clear modernization upside — but it comes with a renovation to-do list (yours inside, the building's outside) that the low headline price already reflects.
