Thanks, everyone for your kind responses! 

The Candlewick offices are new, having just made the horrendous move from Cambridge to Somerville MA.  In the old building, Candlewick was spread out over two floors but now they're housed in one large, meandering space, which includes sections for editorial, sales, art, marketing, etc.  There's a room for their out-of-print books, and a room for their newest books.  Also a reference library of current picture books from other publishers which helps in researching illustrators, and recently  published subjects.  Every editor's work cubicle is lined with shelves, holding piles of books in progress.  Boxes of new books, fresh from the printers, took up floor space here and there.

There's a lot of creating going on in that building and it was fun to see and imagine!

Ten years ago when I began writing for children, I never dreamed I'd one day visit a publishing house and meet my editor face to face.  But it happened last Friday.  My writing daughter, stacy_dekeyser, and I drove from Connecticut to New Hampshire for the spring NE-SCBWI conference, and we were invited to stop in Somerville MA to see the Candlewick offices and meet editor Andrea Tompa. 

Right inside the entrance I saw my book Virginnie's Hat on their display case of recent books!  (It's on the lowest shelf, second book from end on the left.)  A welcoming touch!

And then I got to meet Andrea!  She's a warm, charming, and delightful person, and very, very smart!