Greenbuildinginfo.eu is the only green office building information portal in Europe, which helps the office seekers find their green office building according to office space, Green certification and office rental cost. This can be in either a green office building which is planned, under construction or existing. The portal can be used to introduce the green building office market; the supply of office buildings and offices for rent which are green/ sustainable and the renting transactions and handover of the office buildings. These are categorized as born to be green which means they were green from construction, Green in use which are those building's which have been renovated to be green or those green buildings which are for sale. It provides useful information to the green office seekers, which helps them during the search for their new sustainable office. Several services of the portal are only available after the tenants, office searchers register. With the help of these functions you can save your favorite green office buildings, you can view the last 20 offices you clicked on, compare green office buildings, send a request for proposals to all of them at the same time and you can also ask for a notification if a new office building meeting your search criteria turns up on the market. You can browse easily with the help of the search function of the portal in the different categories; certifications or M2 of office space. You can narrow your search according to size or rental cost and you can also identify the exact location of the office building on the map. Calculators are also available on greenbuildinginfo.eu , which help the tenants estimate the cleaning, furnishing and the monthly rental cost of the office. The videos and 3D trips of the green office buildings give the office searchers the feeling of being there.