I live in Brookland, DC, just over the line. I like Mt. Rainier houses, they're very similar to what's over the line in DC. The issue with Mt. Rainier and PG County in general are the property taxes. I currently pay just under $2k/year on assessed value of $360k. I think the high taxes in PG County are what's holding real estate back there.
That's interesting, Ward 5 Resident. When we were house hunting a couple of years ago we considered Brookland and Woodridge, too. We calculated that even including the (much) higher taxes, home prices were lower across the line in Maryland. Maybe there's more cachet to a DC address than a PG County one.