This leopard exhibit is of cause old and not up to today standarts, there is no discussion.
There are altogether 3 such "aquaria" side by side and normally doors between them are open, so that animals can use all of them at one time. 4 North Chinese leopards live there just now - 5 years old female Mandží and her three 20 months old sons Ku, Jao and Šan. These males will be sent to other zoos within next weeks, and because the current European population of this subspecies is skewed towards females, I think there will be no problem to find them new appropriate homes.