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Turning historic substance into resilient yield.

In the old town of Bremgarten, a heritage-protected property is being fully renovated: five high-quality rental apartments above a modernized commercial space, with underfloor heating, a lift and two new basement levels. smzh leads the decisive value stages from property access through to successful leasing.

Bremgarten AG, old-town property: Turning historic substance into resilient yield.

Starting point

1 heritage-protected old-town property

An old-town property in a central location, with substance worth preserving and potential for a high-quality reordering of residential and commercial use.

Challenge

Heritage protection, existing substance and a fixed use mix of residential and commercial had to be brought together economically.

Planned result

5 rental apartments

Five high-quality rental apartments above a modernized commercial space – fully renovated in keeping with heritage requirements and geared toward successful leasing.

The biggest value levers at Bremgarten:

Blue marks a value jump.

01 Property access

    02 Feasibility

      03 Usage concept

        04 Structure

          05 Permitting

            06 Capital

              07 Implementation

                08 Leasing

                  09 Exit

                    Project profile:

                    Location

                    Bremgarten AG, old town

                    Starting point

                    Heritage-protected old-town property

                    Use

                    Residential and commercial

                    Apartments

                    5 high-quality rental apartments

                    Gastronomy

                    Restaurant incl. take-away

                    Intervention

                    Heritage-compliant full renovation

                    Fit-out

                    Floor heating, elevator, 2 new basement levels

                    Status

                    In execution

                    A heritage-protected old-town property being turned into five high-quality rental apartments and a modernized commercial space.

                    New eat-in kitchen with stone countertop.
                    New eat-in kitchen
                    Living space with herringbone wooden floor and new fittings.
                    Living space
                    Bedroom with built-in wardrobes and an adjoining bathroom.
                    Bedroom with built-in wardrobes
                    New bathroom with a floor-level shower.
                    New bathroom with a floor-level shower.

                    Heritage protection sets limits. That was precisely the challenge.

                    The property is centrally located in the old town and has historic substance worth preserving. Heritage requirements limited straightforward interventions; at the same time, the commercial space and apartments were not being used in line with the market. The challenge was to preserve the historic substance and yet reorder use, building services, and yield so that the existing property becomes a leasable, income-generating asset.

                    New self-supporting staircase between preserved beams.
                    New self-supporting staircase between preserved beams.
                    Attic kitchen with exposed historic roof truss.
                    Attic kitchen with exposed historic roof truss.
                    Exposed rubble-stone masonry as part of the living space.
                    Exposed rubble-stone masonry as part of the living space.
                    Attic with exposed historic roof truss.
                    Attic with exposed historic roof truss.

                    Existing substance becomes a permitted and leasable income-generating asset.

                    Feasibility clarified

                    Heritage protection, existing substance, intervention, costs and use had to align economically. Only from this did a viable conversion project emerge.

                    Permit obtained

                    The full renovation had to be permitted in keeping with heritage requirements – with floor heating, an elevator, two new basement levels and a marketable fit-out standard.

                    Lease prepared

                    Five high-quality rental apartments and a modernized commercial space have to hold up in the market after completion. Only successful leasing makes the yield resilient.

                    This is how existing substance becomes a viable income-generating asset.

                    Value jump

                    01 Property access

                    The first question is not maximum change, but economically viable use of the existing property.

                    • Starting point: Heritage-protected old-town property: central location, substance worth preserving, use below market potential.
                    • smzh decision: First clarify which use, quality, and depth of intervention the location and substance economically allow.
                    • Value lever: Location, existing substance, use restrictions and yield potential assessed, and set as the basis for the project.
                    • Result: A clear target: high-quality rental apartments and a modernized commercial space instead of use below market potential.
                    Value jump

                    02 Feasibility

                    Feasibility shows whether existing substance can become a resilient project.

                    • Starting point: Heritage protection, existing structural engineering, access, building services and use mix set tight parameters.
                    • smzh decision: Assess early whether requirements, structural intervention, costs, use, and yield align.
                    • Value lever: Heritage requirements, structural engineering, depth of intervention, costs, use, and yield brought together into a feasibility basis.
                    • Result: A viable target: heritage-compliant full renovation with floor heating, an elevator, and two new basement levels.
                    Value jump

                    03 Usage concept

                    The use mix has to work in operation, not just on paper.

                    • Starting point: Commercial space on the ground floor without viable use, apartments below market quality.
                    • smzh decision: High-quality rental apartments above a modernized commercial space.
                    • Value lever: Use mix of residential and commercial assessed for leasability, operation and yield.
                    • Result: Five high-quality rental apartments and a modernized commercial space as a marketable target.

                    04 Structure

                    The property has to work as an economic unit, not as the sum of individual spaces.

                    • Starting point: A heritage-protected building with several uses, requirements, and economic interdependencies.
                    • smzh decision: Align operation, financing, renovation and later leasing to a shared target.
                    • Value lever: Operating logic, financing, and conversion planning aligned to a shared yield logic.
                    • Result: Structure aligned with renovation, financing, and later operation; project in execution.
                    Value jump

                    05 Permitting

                    With heritage-protected substance, permittability is the critical path.

                    • Starting point: Heritage-protected substance, new building services, new access, and interventions in the existing fabric.
                    • smzh decision: Clarify permittability before implementation, financing and leasing.
                    • Value lever: Heritage conservation, authorities, and planning coordinated, and the building permit for the conversion obtained.
                    • Result: Building permit obtained; the conversion is being carried out in keeping with heritage requirements and along the target.

                    06 Capital

                    Capital follows resilient foundations, not historic substance alone.

                    • Starting point: Heritage-protected substance used below potential: financing needs transparency over costs, yields, and risks.
                    • smzh decision: Make the project financeable through costs, yield, use, and risk.
                    • Value lever: Renovation costs, yield expectations, use mix, and risks translated into a financeable structure.
                    • Result: Financing secured along the target; conversion in execution.

                    07 Implementation

                    Historic substance stays visible, building services and fit-out become marketable.

                    • Starting point: Full renovation of a heritage-protected old-town property with high demands on substance, building services, and use.
                    • smzh decision: Full renovation led along the target: floor heating, elevator, two new basement levels, and marketable fit-out.
                    • Value lever: Historic substance preserved, building services renewed, access improved, and fit-out aligned to future letting.
                    • Result: In execution.
                    target stage

                    08 Lease

                    The benchmark is not the renovation, but the stabilized yield afterward.

                    • Starting point: Lease and operation are being aligned to completion.
                    • smzh decision: Make the stabilized yield after renovation the benchmark, not the renovation itself.
                    • Value lever: Rent logic, target tenants, apartment standard and commercial use aligned to yield after completion.
                    • Result: Lease and yield will become visible after completion.
                    target stage

                    09 Exit

                    The exit is a capital decision after stabilization, not a last-minute fallback.

                    • Starting point: After completion and leasing, the question is whether holding, partial sale or sale makes the most sense.
                    • smzh decision: Align holding, partial sale or sale to risk-adjusted value and portfolio logic.
                    • Value lever: Renovation, use, leasing, and yield logic managed so that several capital options remain open after stabilization.
                    • Result: Capital options are deliberately kept open until completion and stabilization.

                    Which decision is coming up for your property project?

                    Whether existing property, development, financing, lease or sale: we assess your starting position and show which next steps matter for structure, capital, implementation or exit.

                    Assess project

                      Create investor profile

                        Consider selling

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