Sebastian Wallis serves as a Senior Leader on the Valuation team in the UK. With more than 25 years of experience in the UK property industry, Sebastian brings a focus on high-value residential development and investment assets across prime central London and major regeneration zones.
Based in London, Sebastian is widely regarded as a trusted adviser to UK and international banks, landowners, developers, housebuilders and family offices. His expertise spans valuations for financial reporting, secured lending, acquisitions and viability assessments. He has worked across the full spectrum of residential product types, including Build-to-Rent (BTR), co-living, super-prime and multi-phase residential and mixed-use developments.
Prior to joining Newmark, Sebastian led CBRE’s London Residential Valuation team, where he oversaw a large team of professionals and was instrumental in expanding the size of the practice. Earlier in his career, he was a Partner at Knight Frank, where he led the firm’s London Residential Development Valuation team for more than a decade. Most recently, Sebastian served as a senior consultant to a family office, where he advised on portfolio refinancing and supported the successful delivery of multiple residential developments across central London.
Education
He holds a Master’s in Property Valuation and Law from Cass Business School (City University, London) and a Bachelor’s degree in Town Planning from Oxford Brookes University.
