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Development Land
Commercial Landlords & Tenants
Assets & Portfolio Management
ESG & Sustainability
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Development Land


At Simon Brien, our strength lies in real-world experience. We’ve successfully delivered multi-million-pound commercial developments on behalf of investors, funders, and developers across the UK, Ireland, Europe, and the USA.

We offer end-to-end support – from sourcing and acquiring development land, to planning strategy, development consultancy, and marketing – all designed to maximise returns at every stage. Whether you need full project support or input on a specific phase, our team is here to help.

With over 40 years’ combined experience in the development land sector, our dedicated specialists bring deep insight and commercial acumen to every project. Our track record includes advising some of Northern Ireland’s largest public and private developers, leading major land transactions, and guiding landowners with clarity and confidence.

Our goal? To help you unlock the full potential of your land and deliver value that goes beyond the deal.

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Commercial Landlords & Tenants


Simon Brien and our franchise partners are leading experts in Rent Reviews and Lease Renewals across Northern Ireland. With more than four decades of experience, we’ve built a reputation for delivering strategic advice and effective negotiation on behalf of both landlords and tenants.

Our Landlord & Tenant and Lease Consultancy services support a wide range of clients – including landlords, occupiers, investors, and funders – ensuring that lease events are managed professionally and to maximum commercial advantage.

Our services include:

  • Strategic negotiation of Rent Reviews and Lease Renewals
  • Full Due Diligence for acquisitions and disposals of leasehold interests
  • Lease Restructuring to unlock value or improve flexibility
  • Accurate, evidence-based Rental Valuations
  • Independent Expert Witness services in lease or valuation disputes

Whether you’re navigating a complex lease renewal or seeking clarity on rental value, our experienced team offers clear guidance, backed by in-depth market knowledge and a commercial property mindset.

Assets & Portfolio Management


At Simon Brien, we believe that strong commercial property investment starts with even stronger asset and property management. With a proven track record across offices, industrial units, retail (both high street and shopping centres), and leisure assets, we take a hands-on approach to deliver long-term value.

We don’t just manage properties – we optimise them. By getting under the skin of your assets, whether single or multi-tenanted, we uncover inefficiencies, spot opportunities, and implement strategies that boost performance, attract quality tenants, and command premium rents.

  • Commercial Property Asset Strategy
  • Commercial Property Performance Reviews
  • Commercial Property Management
  • Commercial Property Sale and Letting
  • Commercial Property Search and Acquisition

From day-to-day operations to long-term planning, we work alongside you to enhance asset value and drive returns at every stage.

ESG & Sustainability


Sustainability in the Built Environment is Key to Long Term Value and Success. The built environment globally has a lot to answer for, contributing almost 40% of Co2 Emissions every day. Now is the time to make our built environment a sustainable one, with the biggest challenge being for existing and ageing buildings.

Increasingly investors are becoming more aware and conscious of the energy performance of buildings and in the months and years ahead this will no doubt continue to impact on value for landlords; as end users, lenders and the government ramp up requirements for sustainable space and green investments.

There is no doubt that your environmental, social and governance (ESG) proposition will drive value in your property portfolio, deliver real operating cost reductions, present opportunities for wider economic support and better lending terms; as well as attract stronger covenant end users and tenants who appreciate the long-term impact of sustainability and ESG in their built environments.

The Simon Brien network are equipped with the expertise to advise on strategy and solutions for long term sustainability, asset value retention and creation, including:

  • Overview and Market Insights Specific to Client Industry
  • Audit of Existing Property or Portfolios
    • Energy Efficiency Review
    • Carbon Output Review
    • Cost Monitoring
  • Recommendations for Improvements and Costs
  • Asset Valuation Forecast / Appraisal
    • Considering the impact of sustainability heading towards 2050
    • Valuation Forecasting
    • Considering the impact of improvements on market attractiveness
  • Programme of Improvement Works
    • Project Management of Short Term/ Immediate Improvements
    • Project Management of Long Term/ Planned Improvements
  • Ongoing Monitoring and Management
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