A lot of fanfics lately have been using the -Ke suffix to denote "the home
of" as in Tendou-ke....  It seems to be used in this context to refer to a
*place*

Now, in the course of looking it up to find the proper kanji, Zen has
become confused.

Zen's Wa/Ei Jiten has only one definition of the -ke suffix, and it *is*
household... sort of.  According to this book, it means *family*, not
*home*.  So, the Tendou-ke would refer to the Tendou Clan, or the family
as a group.

Can anyone provide Zen with areference for its use to mean "the home
of"?
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Well, unless I'm greatly mistaken, the character used in, for example,
"Tendouke" is the same character for "ie", or "house".  I believe, though,
that the concept of household may be apropos here, in that it seems to
refer to both house and family.  I seem to recall that, at the beginning of
the Shinnosuke storyline, Akane answered the phone with the phrase
"Tendouke", which I would interpret to be similar to saying "Tendo
residence" in the United States.  Frankly, though, I don't know if the term
"Tendouke" would be appropriate if you wanted to refer to just the house
(as distinguished from its residents), but my suspicion is that you
wouldn't...