Nine months after Denver launched a housing program that drew national headlines for its innovative approach to helping lower-income families, it’s serving nowhere near the 400 families Mayor Michael Hancock envisioned. So far, it’s more like three families. Stateline, a publication of Pew Charitable Trusts, first reported the figure this week. Another four households have signed leases but haven’t yet moved into their units, and seven more are interested, said city housing staffer Laura Brudzynski. “We really wanted to make sure that we were launching this program very intentionally and thoughtfully,” she said in an interview.