None building structures have been known up to now featuring accommodation of public premises such as museums, exhibition galleries, information and promotion/exhibition centres and recreation/rest quarters, while providing facilities for balloon flights over the town or neighbourhood area where the building according to the invention was raised about.

The specific features of the recreation and utility building according to the invention consist in that its horizontal cross-section looks ring-like, preferably with the outer and inner circumferences formed as equilateral triangles ; sides of such triangles constituting convex arcs directed outwards and reaching beyond the triangle vertexes and thus forming a ring of three intersecting segments. A free space surrounded by such a building serves as a shelter/landing place for a balloon tied-up with a basket. There are at least three masts, each of them higher of the building, spaced alongside the perimeter of the building or close to it.

The masts function as guiding for ropes connecting the balloon and the basket with hoisting winches. There is a sliding roof over the space serving as a shelter and landing place for the balloon tied-up with the basket. In a particular form of the invention a sliding roof consists of three sliding panels drawing apart simultaneously, and each panel consists of three overlapping leaves.

In another particular form of the invention individual stories are interconnected by moving inclined sidewalks.

The solution according to the invention makes possible to ascend over all local buildings and nearby heights, which will be a scenic as well as learning attraction, while giving opportunity to see painting and art galleries, museums, shows promoting products and services, to go to restaurants, bars, cafés, enjoy concerts, variety shows. All that will make the solution according to the invention an essential attraction of any area or town.

The concept of the invention has been explained in drawings, enclosed. Fig. 1- presents an exemplary version of the invention by showing a general axonometric projection, top view, of a skeleton construction of the building together and a balloon tied-up with a basket, situated high above the building, when the roof over the balloon landing place remains closed. Fig. 2-top view of the building and the balloon when resting on the landing place within the space enclosed with the building walls. Fig. 3-the situation presented in Fig. 2 but shown as a cross-section as marked in Fig. 2. Fig. 4-top view of the building, the roof over the balloon shelter/landing place fully closed. Fig. 5-similar view as in Fig. 5, but the roof partially open. Fig. 6-similar view as in Fig. 5, but the roof completely open. Fig. 7-a view of one roof panel. Fig. 8-a fragment of a mast, as marked in Fig. 1. Fig. 9-a view of a skeleton construction of the building stories with exposed inclined interconnecting sidewalks.

The recreational and utility building according to the invention consists of a metal frame construction supported on steel posts, with walls completely glazed-over and flared bell-like upwards. The horizontal cross-section of the building according to the invention is ring-shape with the outer and inner circumferences formed as equilateral triangles; sides of such triangles constituting convex arcs directed outwards and reaching beyond the triangle vertexes, thus forming a ring with three cross-cutting segments: 1, 2 and 3. The free space P surrounded by such a building serves as a shelter/landing place for a balloon 4 tied-up with a basket 5. There are three masts 6, 7 and 8, each of them higher of the building, spaced alongside the perimeter of the ring-like metal-frame construction of the building, at the ends of sides reaching beyond the ring area of the building. The masts 6, 7 and 8 function as guideways for ropes 9, 10 and 11 connecting the balloon 4 tied-up with the basket 5-with hoisting winches W placed near or inside the masts 6, 7 and 8. The ropes 9, 10 and 11 pass through the masts 6, 7 and 8 (see Fig. 8. Over the free space P serving as a shelter and landing place for the balloon 4 there is a sliding roof 12. The sliding roof 12 (see Fig. 4) consists of three panels drawing apart simultaneously: il, 2 and S3, and each panel consists of three overlapping leaves A, B and C (Fig. 7). When the roof is open, the three leaves A, B and C of each of panels S1, S2 and S3, are positioned one over another in chambers pertaining thereto, each chamber constituting a section of the building-1, 2 and 3, respectively. Individual stories K of the building according to the invention are interconnected, besides an elevator, by moving inclined sidewalks L.