The team of STONE22

STONE22 is a small, close-knit team of experienced developers and property managers. Our ambition is one of continuous innovation. This results in innovative buildings and enduring partnerships with our clients.

Geert Haksteen

Partner

My drive
Seeing and seizing opportunities: that is one of the reasons why I chose entrepreneurship. Entrepreneurship gives me energy. The social dimension of our projects is also an important driver for me. It is amazing to be so closely involved with the most innovative developments in healthcare and science!

My focus
STONE22 contributes to the strengthening of the knowledge infrastructure in the Netherlands, and to sustainable and profitable property ownership of investors and foundations. Through STONE22 I have long been involved in development and acquisition for the Amsterdam Science Park, and in the development of research buildings in various science parks throughout the Netherlands. Within our office I am primarily involved with the contractual and financial aspects.

My experience
After studying architecture at TU Delft and Business Administration at Erasmus University Rotterdam, I worked as a consultant at Twynstra. Subsequently, I assumed various management positions with a focus on property management, asset management, and development. At the age of 32 I was appointed Head of Facility Services and Real Estate of Erasmus MC, and five years later I became Managing Director of Beurs Rotterdam N.V. (Beurs-World Trade Centre Rotterdam). In 2002 I started my own company and since 2009 Mark Achterberg, Paul Nijhout, and I work together under the name STONE22.

Paul Nijhout

Partner

My drive
Creating inspiring working and living environments: that’s what gives me energy. On the one hand, you want to optimally fulfill the wishes and requirements of the client and future users, and on the other hand there is the challenge of ensuring that buildings are smart, future-proof, and aesthetically appealing. To me, that is the art of development.

My focus
With STONE22, as a team, we are increasingly focused on research buildings in science parks and on the development of campus locations. We want to be of service to the scientists of the future. I focus mainly on the project development side of things. This means that I am not only engaged with the content and organization of the design, from concept to realization, but also with the contracting of construction partners. I also ensure that the realization of a project remains within its financial framework.

My experience
After studying Civil Engineering at TU Delft and earning an MBA at Erasmus University/Rochester University, I worked for over 10 years in construction before moving into project development. Holding various management positions, I have contributed to the development and realization of numerous compelling projects.

Mark Achterberg

Partner

My drive
I like to focus on the development, (re)structuring, optimization, and management of multi-tenant and multifunctional commercial real estate. Through the generation and implementation of concepts around themes such as media, energy, and science, a piece of real estate becomes unique and, therefore, attractive for both users and owners. And, with that, my mission is accomplished.

My motivation
I am in my element when working in an environment where I can make a real difference through open and enjoyable cooperation. The starting point for me is always this: a satisfied owner and a satisfied user of a developed and managed building and its surroundings. At STONE22 I am mainly concerned with integrated property management and commercial matters.

My experience
After graduating from college with a major in real estate and a post-graduate degree in real estate management, I gained experience as a manager of a national real estate agency and have since then performed in various management roles, both with a developer and with investors of multi-tenant business centers. Subsequently, on behalf of banks and investors, I have had the opportunity to realize and manage a variety of appealing and enjoyable projects with my colleagues. Such as, for example, performing as director of the Energy Business Park Arnhems Buiten, and as co-owner of the management company of the Mediapark in Hilversum.

Paul Graven

My drive
I like to bring quality to organizations. I focus on process optimization, financial management, IT, interim management, business advice, and I am a good sparring partner. Long-term partnerships with clients are my starting point. Sustainability is an important theme for me. That is why, outside STONE22, I am also involved in various innovative projects in the field of sustainable urban logistics and last mile delivery, among other things.

My focus
At STONE22 I am responsible for the finances of both STONE22 itself and of the real estate management we do on behalf of external clients. I organize the finances related to property management and deliver the quarterly reports to clients. STONE22’s real estate management is professionally designed so that our clients can reliably use data to steer their enterprises.

My experience
After completing my studies in business economics I held various management and executive positions, including in the IT and real estate sectors. In 2013 I started my own company, Menggali Finance & IT, which deals with optimizing business processes and systems, outsourcing, and interim management. In recent years I have specialized in real estate companies. This is because real estate management and development requires specific financial expertise.

Robert Paul Balder

My drive
How do you create appealing, practical, and delightful workplaces for people? That’s what fascinates me. I have always been a stickler for organization. Thus, when developing new buildings, I like to apply my organizational talents. Acting as a liaison between the client, the end user, and the design team is the best job there is! I get to see high-quality (work) spaces in our buildings grow, literally and figuratively, from the drawing board to reality. And, because a society consists of more than bricks and mortar, I also find it important to be active in volunteer work.

My focus
My task as project manager is to provide support to all stakeholders during the design and realization process: process-wise, financially, and professionally. I ensure an efficient follow-up of all requests, questions, and decisions that arise during a building’s development process. A building must not only be aesthetically appealing and sustainable, but also practical, safe to use, and with its amenities logically situated. I enjoy playing a linking role between the architect, contractor, client, and whoever else is involved.

My experience
After studying Facility Management, I worked for several years as a facility manager and facility services buyer. At the Amsterdam Science Park I was able to grow into an all-round real estate professional at Matrix Innovation Center. At this time I also completed my studies in construction business administration. Because of my work as project manager and landlord of laboratory and office space , I have gained considerable knowledge in purchasing technical services and laboratory equipment, Park Management, leases, environmental legislation, BREEAM, WELL, Occupational Health and Safety, and Security.

Gabrielle van Galen

My drive
I interact with the tenants of our buildings on a daily basis, particularly those in our impressive, historic multi-tenant buildings. As a commercial real estate manager, one is not only involved in the rental negotiations. I enjoy contributing to the growth of the companies in our buildings by ensuring that the basics are in place: suitable accommodation. Match-making between the right tenants for a given location is a delightful challenge for me. In this way I come into contact with many companies, and this keeps my work both varied and interesting.

My Focus
STONE22 focuses on the commercial leasing of high-quality buildings in both science parks and on campuses. We also provide property management for a number of multi-tenant buildings in the creative sector, among others. Customer satisfaction of both tenants and clients is my top priority. It is a crowning achievement whenever a former client returns to find a suitable accommodation, or an existing client turns to us to expand their real estate portfolio.

My experience
My career has a clear common thread, and that is real estate! Whether my job title is Asset Manager, Rental Manager, or Portfolio Manager, I understand the art of helping property owners find the best match in terms of tenants, and vice versa. In addition, I have built considerable expertise around flexible housing concepts. I look back with pleasure on the challenging real estate positions I was tasked with fulfilling as Portfolio Manager for Corio (now Klepierre). I am even more proud of the growth of STONE22, where we are building a growing portfolio of research buildings for public and private partners.

Ingrid Rocha Lopes

Office Manager

My drive
I am the creative, practical organizer and a linchpin of STONE22. My focus is office management. I pick-up whatever needs to be picked up. The real estate world suits me, loud and clear. Where I once dreamed of a future as a groundskeeper, horse trainer, or artist, it turned out that my greatest strengths lie in supporting and arranging all manner of processes. At STONE22 I feel completely at home in that respect!

My focus
I support the management of STONE22 in general, and I offer support to the property management branch. I look ahead to identify, signal and solve problems. I get the most energy from completing projects that are important to our customers: good lease contracts for tenants, ensuring there are signed contracts for large projects, and efficiently arranging appointments by email.

More about me
I have broad experience in real estate and brokerage. I hope others see me as a hardworking, fun, and sometimes zany person. Well-timed humor keeps life light and fun.