There's a difference between lease, occupation, and annexation. Wikipedia gets it wrong saying it was ever annexed, it was occupied. The reasons I'm saying it was leased in the same year are: 1) it doesn't take that long to negotiate "we'll keep it until..." (even peace treaties are negotiated faster) and 2) the New Territories, Weihaiwei (both occupied in 1898), Kiaochow (occupied in 1897), and Port Arthur (occupied in either 1897 or 1898) were also leased in 1898. An analogy with 2) is very reasonable, especially in light of 1).
I told you I love splitting hairs. I'm also very good at it. You won't find a better hair-splitter on this board.
Case closed, back to the original discussion.
I think that if there are 3 foreign possessions on the coast of southern China, rather than 2, some economic union might take place between them.