On vous rappelle !


    icone chasseur immobilier Paris

    Apartment hunter in Paris
    At your service for over 10 years


    Are you looking for a professional you can trust to find the flat or house of your dreams? We can meet your expectations thanks to our network and our expertise in the Paris property market.
    To guarantee you a tailor-made service, we make a unique commitment : a maximum of 3 property projects followed up by your COSIM property hunter.



    Your property project deserves Excellence


    We offer you comprehensive, tailor-made support to ensure that your property search is a success. Analysis of your property project, exhaustive research, responsive and targeted visits, negotiation at the right price, securing the property transaction, support with the associated formalities (works, mortgage, notary, etc.).

    Our results demonstrate our total commitment to you

    • An average of 3 to 4 visits to find a property
    • Search time: 32 days
    • Success rate: 78%
    Real estate - Property hunter at Paris and Bordeaux

    A human approach focused on your needs

    Listening, adaptability and responsiveness

    The quality of a service depends mainly on the people behind it. COSIM was founded by Florian Marjolet, and his career path has guided his long-term vision, which all COSIM employees share. We support men and women during a major project in their lives, and our human values are the foundation of our commitment.

    Automation gives way to listening, adaptability, responsiveness and rigor. In addition to their interpersonal skills, COSIM consultants are experts in the Paris property market.

    Discover our team

    Your satisfaction,
    Our driving force

    What they say

    As part of our quality approach, we hold regular meetings with our customers to help them monitor the progress of their property project. Our expertise and advice help to inform their decisions.


    Our search mandate doesn't stop at finding the right property; these reviews highlight a much wider contribution to the success of their purchase.

    Why choose us?

    Reasons to place your trust in us

    Personalisation Trusted third party Exhaustiveness Customer satisfaction Property expertise Save time Money saving Reactivity Sécurisation Independance

    To meet your expectations, at COSIM we give each of our clients "A SPECIAL PLACE " thanks to a unique commitment to resources.

    • Exhaustiveness : access the entire market thanks to our network (over 2,500 negotiators) and our scanning tool.
    • Save time : delegate the sourcing of properties and only visit interesting properties with your apartment hunter.
    • Buying at the right price : take advantage of our expertise with a detailed estimate and optimized negotiation.
    • Security : benefit from a complete analysis of your target property and a careful review of the notarial deeds.
    • Satisfaction guaranteed : payment only on success!

    Our hunting service
    Logo cosim blanc

    The Paris property market

    Our expertise

    The property market in Paris and its inner suburbs has its own unique characteristics. Our flat hunters have been scouring the streets and arrondissements of the capital for many years to find the property of your dreams.


    To help you refine your property plans, we offer a detailed analysis of the Paris property market in each arrondissement of Paris (Paris 9, Paris 11, Paris 15, Paris 17 ...) as well as the neighboring communes.

    Paris vue Paris canal Paris Montmartre Paris tour eiffel