Fixed term leases in an apartment building: terms, extensions and valuation risk

Fixed term leases have become the standard for many Austrian apartment buildings. For legal review, this is not a formal detail. Whether a fixed term has been validly agreed, when it actually expires and whether a chain of extensions has converted the lease into an open-ended one drives the landlord position after acquisition and the buyer's income model.

This article focuses on the contractual aspects of fixed term leases. It describes the statutory requirements for a valid fixed term, the consequences of a defective clause, the effect of amendments and extensions and how the result is translated into a reliable income model. Rent level, guideline rent and indexation are covered in dedicated articles.

Why fixed terms deserve their own review layer

In a typical apartment building review, rent levels and service charges take the lead. The fixed term often looks like a side detail. In reality, it reshapes the income model. A fixed term lease enables re-letting on defined dates, allows repricing in the statutory frame and moves the negotiating position for renovation or condominium conversion.

The fixed term should therefore be reviewed as a separate layer alongside the rent roll and service charge analysis. Treating expiry only as a spreadsheet column overlooks the contractual binding that continues after the purchase. Rent components such as guideline rent are analysed in the article on reference rent, location surcharge and category.

Statutory requirements for a valid fixed term in a residential lease

For apartments within the Austrian Tenancy Act, section 29(1)(3)(b) MRG requires written form and a definite expiry date. For terms agreed, contractually renewed or statutorily renewed after 31 December 2025, the minimum duration is generally five years; three years suffice where the landlord was not a business operator under the Consumer Protection Act. Section 1(4) MRG makes the rule applicable to partially exempt apartments as well. Under section 49k(4) MRG, a fixed term agreed before 1 January 2026 remains governed by the former minimum of three years.

If the applicable minimum duration, written form or definite expiry date is missing, the lease is deemed open-ended. A later amendment cannot retroactively cure an already invalid term, although the parties may make a new independently valid agreement. A condition tying expiry to an uncertain future event also generally fails to establish the definite date required by the statute.

For a buyer, review therefore has to work through the original lease, side letters and the actual start of use. Rent roll entries are not enough. A structured intake can be supported by the data room completeness check.

Extension chains, tacit renewal and amendments

Section 29(4) MRG allows a written extension of a valid fixed term. Again a new definite expiry date and an extension of at least five years are required; three years suffice where the landlord was not a business operator under the Consumer Protection Act. If either fails, the extension results in an open-ended lease. A single formal error therefore reshapes the entire remaining contract relationship.

If the tenant continues to use the premises after expiry without a written amendment, section 29(3)(b) MRG deems the lease renewed once for five years; for a non-business landlord the period is three years. During that statutory renewal period the tenant may terminate at any time to the end of a calendar month with three months' notice. Only after the renewed period expires without further action does the lease become open-ended. For the income projection this creates a defined extension phase before the structure changes to open-ended.

A structured amendment file is not a housekeeping task. It secures the chain of expiry dates and documents deliberate decisions. Where it is missing, the data room should disclose which units have slipped into an open-ended structure and the economic consequences should feed into the model.

Early termination by tenant and landlord

For fixed term residential leases within the MRG, section 29(2) grants the tenant a statutory right to terminate after the first year, with three months' notice to the end of a calendar month. For the income model this is a structural reduction of the binding period. The right cannot be excluded by contract.

The landlord cannot terminate an apartment lease during the fixed term without a statutory reason. The catalogue in section 30 MRG remains applicable regardless of the expiry date. Termination for serious detrimental use under section 1118 ABGB also remains available but has to be assessed carefully.

For commercial premises, early termination is largely a contractual matter. Break options, special termination rights and waivers deserve close attention. The article on commercial premises in an apartment building provides further context on commercial lease drafting.

Fixed terms in commercial leases: different rules

The strict formal requirements of section 29(1)(3)(b) MRG do not apply to commercial premises. A valid fixed term simply requires a defined expiry date in the contract. There is no statutory minimum duration. The statutory early termination right for tenants after the first year does not apply either. The binding effect of the agreed expiry date is therefore stronger.

In practice, this offers stronger planning for the landlord but also more demanding handback duties for the tenant. Restitution, restoration clauses, vacating and compensation for fit-outs need clear treatment. For a buyer, the key question is whether any extension has been documented by amendment or has occurred by mere continuation.

If the tenant stays on after expiry and the landlord accepts rent without objection, tacit renewal under section 1114 ABGB may apply. In economic terms this creates a new open-ended situation whose termination is subject to the usual conditions.

Translating fixed terms into a reliable income model

Four inputs determine the income projection. First, the reliable expiry date per unit. Second, the re-letting potential within the statutory frame. Third, the probability of an early exit by the tenant. Fourth, the effort for re-letting, refurbishment or restructuring between two leases. Only these inputs together produce a defensible model.

For apartments under full application, the fixed term discount under section 16(7) MRG reduces the permitted new rent by one quarter. The discount lapses if the lease converts into an open-ended one. Rent level in general is treated in the article on reference rent, location surcharge and category.

For commercial premises the analysis turns towards a follow-on plan. If a new lease is under negotiation, if a restructuring is intended or if a tender is planned, the outcome belongs in the projection. An internal marker should identify which expiry dates are reliable and which still need review.

Contract clauses and guarantees for buyers and sellers

Sellers should present the fixed term position honestly in the data room and the sale contract. A blanket assurance that all leases are validly fixed is dangerous where the stock contains older standard forms without a definite expiry date or without written form. A unit matrix listing start, expiry, extension, waiver of termination and open items is more accurate.

Buyers should not rely on a generic description. A unit-specific guarantee schedule that reflects the fixed term data per unit is preferable. Ambiguous cases are better handled by disclosure, purchase price retention or a specific carve-out. The apartment building risk check helps prioritise units.

For handover, a per-unit binder that assembles the original lease, amendments and the current expiry chain is recommended. This structure supports post-closing management and makes the buyer's review traceable. The handover process is described on the handover and effective date topic page.