§ 29

In properties without tenant representation, a demand for rent increase under § 23 must be presented simultaneously to the tenants whose rent is to be increased. The demand must be in writing. It must include information on the current budget and the new budget, including operating expenses and income, the amount of the rent increase and its calculation, and the amount of the future rent. The demand must include information on the tenant's right to object, cf. Stk. 2. If the demand does not contain this information, it is invalid.

Stk. 2.If at least one-quarter of the tenants whose rent is to be increased have submitted a written objection to the rent increase no later than 6 weeks after the demand for the rent increase has been received, the landlord must present the case to the rent tribunal within an additional 6 weeks if the landlord wishes to maintain the demand for the rent increase.