wow, pleased with the replies, appreciate your valueable comments/suggestions. [velogirl,joeprim,dbg,flaneur]

yes, joeprim and flaneur, that's kindof what i was looking into.

instead of the common activities that Flaneur has brought up, i have now taken a step further to incorporate [extreme] cycling activities in a hybrid building. still, much in contrast with current cyclists' desire and what you guys have mentioned, but this is something interesting that i could look into at the moment.

[extreme] cycling activities deal with, well extreme stuff, but cycling-related. it's not constrained to BMX stunt, but also MTB/Racer. ie. if i have a 100m long space, how about a speed test track? there will be ample space for bikeshops/workshops/clinics in this building, you can modify your bike. whether for aerodynamics/efficiency/light-weight, try out the added performance of an aerobar/new hubs/derailleurs/sadal/fat-thin tires/custom frame, and have a go on this track. further, with this activity contained in a building, you can have conditioned environment to run your test, for wind resistance maybe?

more to that, slopes for brake efficiency, ramps that challenge your stamina/strength. these spaces are somehow intertwined, to have a sense of density in this building but somehow, have also a clear sense of boundary from each other, in order to carry out the various activities efficiently. there can be linear/circling bike lane, that relates/encompass these spaces together. anything [phenomenal] that should be included?

dgb's comment was right on, especially interesting to incorporate into such a building. because all these activities are contained in a building, there's [freedom restriction]. although not much, as this building is actually [functional]. i should consider extending the streetscape into the building, how easily from the street can a cyclist easily channel into it, having it to blend with the street/surrounding, perhaps, could break away from this restriction?