Who we are
Mobile: +31 (0)6 50 67 11 33
Bart J.H. Oonk started his commercial real estate carreer at the global real estate advisor Savills in 2001. Here he was responsible for managing and renting out the property of a number of national and international real estate investors. First as an account manager at the property management department and then as a realtor at the Agency department at Savills. In 2004, in his new position as real estate manager at the World Trade Center Amsterdam, Bart was responsible for renting out around 120,000 sqm and was involved with various renovation projects. In 2006, he joined Jones Lang LaSalle, where as senior consultant, he assisted international and national organisations in finding property to rent or buy and various international and national real estate investors and developers in renting or selling out their property.
Eric Welboren MRICS
Mobile: +31 (0)6 50 67 10 79
Eric N.B. Welboren MRICS has been working in the real estate market since 1997. The first eight years of his career, Eric worked as a residential realtor in Alkmaar. Initially an intern, he grew through the ranks from assistant realtor to certified realtor/appraiser to branch manager. After completing various courses in real estate, in 2006 Eric decided to move to Amsterdam and focus entirely on commercial real estate. He joined the leading commercial real estate consulting firm Jones Lang LaSalle, where in his post as senior consultant at the office agency department, he assisted international and national organisations and companies in finding property to rent and various international and national real estate investors and developers in renting out their property.
IJsbrand P.J. Willemse
Mobile: +31 (0)6 137 494 62
IJsbrand P.J. Willemse started his career at Ans de Wijn Bedrijfshuisvesting and gained here his working experience in the commercial real estate industry. At Ans de Wijn IJsbrand was primarily responsible for the lease of office and business space. After 9 years of employment with Ans de Wijn Bedrijfshuisvesting it was time for the next step. Since January 2018 IJsbrand has worked at TREC as a real estate advisor, where he mainly focuses on optimizing and expanding the letting portfolio.
Mobile: +31 (0)6 10 97 78 43
Tim Philippus has completed a bachelor degree in ‘Human Geography & Urban and Regional Planning’ and a master degree in ‘Real Estate Studies’ at the University of Groningen. During his studies he was quite active at one of the biggest student tennis clubs in the Netherlands, where he was chairman and secretary of the building committee and the daily board. In September 2016 he started working as real estate advisor at TREC, in this job he is jointly responsible for the letting portfolio.
Mobile: +31 (0)6 83 67 00 91
Stijn Zwart has completed a bachelor degree in ‘Commercial Economy’ at the Amsterdam University of Applied Sciences. During his primary study he also completed a two-year during study to become a ‘shipbroker’ at the STC-College Group. He has completed both of his studies in 2018. During his studies he managed to become the founder of The TNG-Group, an event agency located in Amsterdam. Besides organizing several events he worked as an assistant at Amstel Shipping BV. In April 2019 he started working as real estate advisor at TREC, in this job he is jointly responsible for the letting portfolio.
Marieke Flaes started her career in the real estate market in 2006, as Office Manager / executive secretary at the former GPT Halverton (currently known as Internos). At GPT Halverton she assisted the board members, executed office management activities, organised events and was involved in the marketing and PR of GPT Halverton. Marieke grew through to Marketing Manager. In this role she was responsible for the marketing and PR of the Dutch asset management portfolio, which consisted of office, logistic and industrial properties. In 2011, after a trip outside of the real estate market, Marieke started at the investment management organisation PingProperties as Assistant Director Asset Management. She assisted the Director Asset Management and helped in managing and supporting the Asset Management team. At TREC Marieke is Office Manager / Commercial employee, in which she is responsible for several commercial tasks within the office as well as supportive assistance.
Patty Nagel started her career in the real estate market in 2009. She started as receptionist/Office Manager at the investments management organization PingProperties, where she was responsible for organisational and secretarial tasks. From this position she grew through to a full-fledged secretary and together with Marieke Flaes she helped to support the entire Asset Management team. After a (short) transfer to Savills in 2014, Patty joined CBRE as a team assistant in 2015. In this position she mainly focused on supporting the consultants in the two sub-areas Amsterdam Center and Amsterdam Southeast. She supported with the organization of events, making pitches, drafting all documentation and various supporting tasks. Patty has been working at TREC as secretary/Office Manager since June 2018.