From their windows and balconies, Denver residents can see that the micro-communities Mayor Mike Johnston and the city have planned for his homeless House1000 initiative — and debated with residents for months — are no longer just designs and concepts. At least four are currently being built: one in the Golden Triangle neighborhood, at 1375 Elati Street; one in Overland, at 2301 South Santa Fe Drive; one in Baker, at 950 West Alameda Avenue; and one in Central Park, at 12033 East 38th Avenue…