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Lease agreement with 80 m² of living space next to a floor plan with actually 68 m² – difference in living space of 15 percent
Discrepancy in living space: When is a too small apartment entitled to a rent reduction?

Status: November 2026 · Attorney Helmer Tieben, Cologne In short:

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Married couple in Denmark after marriage with documentation for the spouse to follow and a national visa for Germany
Getting married with a Schengen visa: residence permit after marriage in Denmark?
Plaintiff had travelled from Belarus with a Schengen visa for visiting purposes
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Commercial lease agreement with keys and deed books to § 566 BGB and § 307 BGB upon change of landlord.
Change of landlord in commercial lease: transfer clause, sale and rights of the tenant

Status: November 2026 · Attorney Helmer Tieben, Cologne In short:

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Man checks his tax return and child support payments for his parents. In the background is an elderly couple
Parental support deducted from taxes: Maximum amount in 2026 and nursing home costs

Status: November 2026 · Attorney Helmer Tieben, Cologne In short:

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Illustration of a move with a DSL router and an internet contract, with special termination rights in the event of a change of residence.
Internet contract when moving: When does the special termination right apply?

Status: November 2026 · Attorney Helmer Tieben, Cologne In short:

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The woman holds an ear to the closed window of her apartment while cars and a truck drive by outside.
Rent reduction due to traffic noise: requirements and judgments

Status: November 2026 · Attorney Helmer Tieben, Cologne In short:

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The property manager examines documents alongside a model of a multi-family building, keys and a scale as symbols of legal responsibility.
WEG administrator: When is he liable for exceeding his authority?

In short: Without a decision, the administrator may only make minor or

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House slippers with the material designation ‚100% wool‘, magnifying glass and material samples
Competition law: Misleading advertising due to inaccurate material information

Status: November 2026 · Attorney Helmer Tieben, Cologne In short:

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Biogas plant with green fermentation tanks near a residential house in rural area
Odour nuisance caused by biogas plants: What can neighbours do?

Status: November 2026 · Attorney Helmer Tieben, Cologne In short:

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Renewable energies
Renewable Energy: International tax treatment of cross-border organised community wind funds
Many Questions regarding international tax issues arise when community wind
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