Commercial share

The commercial share refers to the percentage or absolute proportion of space used for commercial purposes in a mixed-use property. It is a key indicator for investors, buyers, and lenders, as it significantly influences a property’s risk profile, expected returns, and financing potential. A building with a high commercial share behaves differently on the market and in terms of financing than a purely residential building.

Impact on Financing and Valuation

Banks value properties with a high commercial share more conservatively, as commercial leases can be more volatile in times of crisis and marketing the property after a vacancy is more challenging. Many financial institutions apply different financing terms for commercial shares exceeding 20% or 30%-higher equity ratios, lower loan-to-value ratios, or shorter loan terms. For the determination of income value, the commercial share is valued separately using commercial rent indices and comparable rents.

In practice, this means for buyers of mixed-use properties: Anyone purchasing a building with a 40% commercial component will not receive financing from most banks under the same terms as for a purely residential building. Often, a shorter amortization period or a higher equity ratio is required for the commercial portion. We recommend clarifying the financing of mixed-use properties with several banks early in the purchase process to avoid surprises when the financing commitment is issued.

Tax Implications of the Commercial Portion

If the commercial portion of a property exceeds 50% of the usable floor area, the entire property may be classified as business assets, with corresponding implications for business tax and depreciation options. The commercial portion is also relevant for sales tax: Landlords can opt for sales tax on commercially used areas and thus claim input tax credits-this is not possible for the residential portion.

The tax treatment of the commercial portion has a direct impact on the calculation of returns. In the case of a building with a 30% commercial portion for which the VAT option is chosen, two separate accounting systems are created. This significantly increases administrative costs and should be taken into account in the profitability analysis. Tax advisors specializing in real estate can provide significant added value here.

Differences in Tenancy Law Between Residential and Commercial Portions

An often underestimated aspect of mixed-use properties is the fundamentally different legal framework for tenancy: The residential portion is governed by the German Civil Code (BGB) with its extensive tenant protection provisions (protection against eviction, rent control, and the Operating Costs Ordinance). For the commercial portion, however, freedom of contract generally applies-rent adjustment clauses, value protection clauses, and graduated rents are freely negotiable.

Commercial lease agreements offer landlords significantly more flexibility but also carry greater risk: Tenant turnover is typically higher for commercial tenants than for residential tenants, and the costs associated with re-leasing (renovation, brokerage fees, vacancy period) are substantial. A well-drafted commercial lease with a sufficiently long term and clear renewal options is therefore a key value driver for mixed-use properties.

Commercial Share and Residential Use: Zoning Restrictions

Zoning plans often specify the permissible ratio of residential to commercial use. In general residential zones (WA under the BauNVO), commercial use is permitted only to a limited extent; in mixed-use zones (MI), residential and commercial uses are generally given equal priority. Anyone wishing to subsequently change the commercial portion of an existing building-for example, by converting a retail space into residential space or vice versa-must verify this under building regulations and, if necessary, obtain a building permit.

It is important for investors to know that an existing commercial use is not automatically guaranteed in the long term: If the zoning plan or the character of the area changes, a previously permitted use may be protected under grandfathering provisions but can no longer be transferred to other tenants. In such situations, the marketability of the commercial portion decreases significantly.

Practical Tip for Owners in Nuremberg and Franconia

In Nuremberg neighborhoods such as Gostenhof, the Old Town, or Ludwigsfeld, there are numerous mixed-use buildings-retail stores or medical practices on the ground floor, apartments on the upper floors. We recommend that buyers of such properties accurately calculate the commercial portion and include a sufficient liquidity reserve in their financing plan, as commercial tenants fall behind on rent more quickly than residential tenants during economic downturns.

Before purchasing, the commercial lease should be reviewed for remaining term, renewal options, and rent adjustment clauses. A commercial lease with a remaining term of ten years and an index-linked rent offers considerable planning security; conversely, a current lease with only two years remaining and no renewal option is a risk factor that should significantly reduce the purchase price. For ground-floor commercial spaces in Nuremberg, the average vacancy period after a tenant change is six to twelve months-this period should be factored into the yield calculation.

Frequently Asked Questions

How is the commercial share calculated?

The commercial share is generally expressed as the ratio of the net leasable area used for commercial purposes to the total net leasable area of the building. Some valuation approaches instead calculate based on rental income: The commercial share of total income can differ significantly from the area share if commercial spaces command higher rents than residential spaces.

Does a high commercial share affect the sale?

Yes. Buyers and lenders pay very close attention to the commercial share. Properties with a high commercial share appeal to a different group of buyers (institutional investors, project developers) and are valued using different methods than purely residential properties. Market liquidity is lower for mixed-use properties-they often remain on the market longer than comparable residential buildings.

Can I reduce the commercial component retroactively?

In some cases, yes-by rezoning commercial space into residential space, provided that building regulations and the zoning plan allow it and sufficient residential space standards can be met. In Nuremberg, the conversion of commercial space into residential space may require a building permit and necessitates coordination with the building authority. In downtown locations where residential space is scarce, such conversion can increase property value.

How does the commercial portion affect the return on investment?

This depends heavily on rent levels and the leasing situation. Well-leased commercial spaces in prime locations often command significantly higher rents per square meter than residential spaces-which boosts the overall return on investment. Poorly leased or vacant commercial spaces in secondary locations, on the other hand, significantly reduce the return on investment and are costly to re-market. A location analysis of the commercial rental space is therefore essential before purchasing.

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