An Office Space Lease Agreement is a legally binding contract between a landlord and a business tenant for the use and occupation of office premises in Australia. It sets out all the terms governing the tenancy, including the description of the office space, the permitted use, the rent payable and GST treatment, the lease term, any option to renew, outgoings obligations, fitout responsibilities, make good requirements, security arrangements, insurance obligations, and the conditions for assignment or subletting.

Office leases in Australia are not subject to the same mandatory consumer protection framework as residential tenancies (governed by state Residential Tenancies Acts) or retail leases (governed by state Retail Leases Acts). Instead, office tenancies are primarily governed by general contract law principles and state property legislation, including the Property Law Act 1974 (QLD), the Conveyancing Act 1919 (NSW), the Property Law Act 1958 (VIC), and equivalent legislation in other states and territories. This means the negotiated terms of an office lease carry substantial legal weight and that both parties should carefully consider all terms before signing.

GST at 10% is payable on all commercial office rent under the A New Tax System (Goods and Services Tax) Act 1999 (Cth). The landlord must be GST-registered and must issue valid tax invoices for each rental payment. Office tenants registered for GST can claim input tax credits on rent paid.

An office space lease may take the form of a gross lease (where the landlord pays all outgoings from the rent received) or a net lease (where the tenant contributes a proportionate share of building operating costs). The outgoings structure is a key commercial negotiating point and should be clearly documented.

An Office Space Lease Agreement is required whenever a business tenant takes possession of office premises in Australia under a formal tenancy arrangement. It is relevant for all types of office occupancy, including professional suites, corporate headquarters, coworking-style dedicated offices, medical or allied health suites, and serviced office arrangements where a formal lease (rather than a licence) is used.

You should use an office space lease when: a business is establishing a new office location; a landlord is formalising the terms under which a business tenant will occupy commercial office space; an existing informal arrangement needs to be properly documented; a lease is being renewed or renegotiated at the end of an existing term; or a business is being sold or acquired and the incoming owner needs the office lease assigned.

A written lease is essential even for short-term office arrangements. Without a written agreement, the terms of the tenancy are governed entirely by the general law, which may not reflect the parties' intentions and can lead to costly disputes about rent, outgoings, security, make good, and access rights.

For landlords, a well-drafted office lease protects the investment by clearly defining the permitted use, ensuring the tenant maintains appropriate insurance, and setting out enforceable make good obligations at the end of the term. For tenants, a clearly documented lease protects the security of the business's physical location and ensures that all agreed incentives (such as rent-free periods, fitout contributions, and option rights) are legally enforceable.

A well-drafted Australian Office Space Lease Agreement should include the following key elements.

The parties and premises section must correctly identify both the landlord and tenant by their full legal names and, for companies, their Australian Company Numbers (ACNs) and Australian Business Numbers (ABNs). The premises must be precisely described, including the suite or level number, building address, postcode, and an indication of the approximate net lettable area. Any included facilities — such as car parking, storage, boardroom access, or common area entitlements — should be listed to avoid future disputes.

The permitted use clause defines the specific purpose for which the tenant is authorised to use the office space. This should be broad enough to accommodate the tenant's business activities but specific enough to prevent uses that might damage the building or interfere with other tenants. Planning and zoning compliance is the tenant's responsibility.

The lease term section sets out the commencement date, initial term, and expiry date. An option to renew — giving the tenant the right to extend the lease for a further period — should specify the option term, the notice period required to exercise it, and the conditions that must be satisfied (including no existing breach). Rent for any option period is typically reset to market rent.

The rent and GST section must clearly state the annual base rent exclusive of GST, the payment frequency, and the payment method. It should also confirm that GST of 10% is payable in addition to base rent under the GST Act. The rent review section documents how rent will be increased during the term — by a fixed percentage, by reference to the CPI published by the Australian Bureau of Statistics, or by market review.

Outgoings, security, fitout condition, make good obligations, insurance requirements, and assignment conditions are all key commercial terms that should be comprehensively documented to protect both parties throughout the lease term and upon its expiry.