The Alternate is one of the largest laboratories ever created.
The reason for its size, is due to the Simulation Room, which basically takes up all of the space of The Alternate.
The only residential space, is for the rooms of the whole building, which also contain the Final NA and The Final Door, with the Final NA being chosen, because it is the largest famous structure that the building can hold, and also made gethering information quicker, without the need to travel vast distances.
In the Simulation Room, real-life sized counterparts can be created and simulated to do whatever one desired, without sacrificing accuracy or realism.
It is also possible, since the simulations happen over every dimension, to enter into the simulation (like VR), from any perspective possible. The staff of The Alternate have thus allowed for special visits and uses of the Simulation Room, under special supervision and under special circumstances, to the general public.
When particularily interesting experiments, or noteworthy ones, are taking place, The Alternate become a sort of tourist attraction, hosting many crowds anticipating the outcome.
All assets are stored in the database, which contains everything up and below. A copy of every structure, verse and phenomena of importance, all the way from the Protoverse to the Final NA, as well as special cases conserning objects smaller than the Protoverse.
It took a total of 3 OYC to finish The Alternate, 1.12 OYC of which, was spent creating the assets, of which, a further 1 OYC was spent exploring and mapping everything as accurately as possible. The rest 0.12 OYC took to actually program everything in place (the physics engine, textures, models, imperfections, dimensions, glitches, law gradiency, etc).
But the majority of the time was spent making the Simulation engine, which is one of the most powerful objects ever built to date. It places easily in the top 500 of all time, and while that may sound like a broad number, one must remember, that to compute a single timeframe in the simulation requires an output much, much greater than that of what The Box has held, within its entire lifetime. The Simulation engine can produce a transfinite amout of frames per finite unit of time.