The latest API patch notes indicated that we will now be able to travel to more than just the player's default house. This is awesome news! I can think of several ways this new functionality could be used in addons.
However, there doesn't seem to be any way to actually know which houses a player has purchased so that you can decide which one to port to (out of simply trying every one of them).
A way around this would obviously be an addon that modifies your guild note (or provides a note people can use for you on their friend's list) to specify which houses people can visit. Another facet of that addon could then use this information and simply present it through a right-click menu with "Jump to house" and a submenu for the different possible houses.
Alternately, can we hope/ask for some function that returns all the valid house IDs for a player id?
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