It is a real estate site and the content is a directory of the various condos available in their community. The pages are all unique and have real valuable content, so I don't think there will be any issues with content quality.
There is new content and blogging that occurs regularly on the site. I think that the client's concern comes from some old concepts that if we're only adding content infrequently, but in mass, that it may be seen as spammy.