Demolition of single-family houses isn't a new phenomenon in Portland, but city permits show it's one that has grown and shifted in the last two years.

In 2013, at least 275 Portland homes were leveled completely, 43 percent more than the previous high in 2007 and 2008. That's about the number of houses sold in an average month in Southeast Portland last year.

These demolished homes are typically replaced by one or two new single-family houses or an apartment building. Infill construction of both houses and apartments is booming in the central city.

Not included in these graphics: Other houses — it's not clear how many more — that were largely demolished in a major renovation that doesn't qualify as a demolition under the city rules.

More on this trend:

-- Elliot Njus and Mark Graves