The Aviary: raising the bar for sustainable office retrofit

Landlords and investors across the UK are facing new pressures to upgrade office portfolios, driven by occupier demand for premium amenities and stringent sustainability expectations.

For the Aviary, ASK Real Estate aimed to transform a legacy property into one of the UK's top-performing office assets in Manchester city centre, extending its lifespan, enhancing energy performance, and increasing market appeal.

The project scope included a full refurbishment to Grade A CAT A specification, with standout amenity spaces such as a rooftop terrace, gym, yoga studio, business lounge, and a revitalised reception. Achieving ambitious environmental targets – NABERS 5*, BREEAM “Excellent”, and EPC A ratings – was essential to satisfy both investor and occupier priorities and secure the long-term value of the asset.

JLL provided an integrated suite of services throughout the project, beginning with acquisition due diligence and continuing through to project management, cost consultancy, and employer’s agent roles.

Our sustainability specialists provided a bespoke Pathway to Net Zero strategy, ensuring all project requirements met the latest industry standards – including de-gassing the building to reduce fossil fuel reliance and improve energy efficiency.

Throughout, JLL applied structured oversight, standardised processes, and continuous monitoring, ensuring consistent quality and compliance with project goals at every milestone.

Delivered in early 2025, the Aviary is setting a new benchmark for sustainable retrofit projects. The building has achieved BREEAM “Excellent” and EPC A, and is on target for NABERS 5 – a particularly aspirational goal for a refurbishment. These certifications showcase the exceptional sustainability outcomes embedded throughout the project.

Distinctive amenities, including a rooftop terrace and wellness spaces, elevate the occupier experience and add tangible value for landlords and investors seeking market differentiation.

The building’s success in attracting tenants is evidenced by the fact that the refurbished spaced is now 90% let to occupiers who are now on site carrying out fit-out works. This demonstrates strong market appeal and rapid letting following completion, confirming the value delivered for the client and the strength of the repositioning strategy.

JLL’s coordinated expertise ensured delivery within the agreed cost plan, with all project aspirations met. Enhanced building quality, improved sustainability credentials, and innovative amenities make the Aviary a reference point for landlords and investors pursuing similar repositioning strategies.

This project illustrates how thoughtful retrofit and integrated consultancy can boost asset performance, de-risk investment, and appeal to forward-thinking occupiers.

Learn more about how we can help you deliver successful retrofit and refurbishment projects