Converting a 3-story house to 3 condos is a great thing for affordability and housing availability. There (mostly) isn't room for new housing in DC, so upping density is the only way!
Not reeeeally though. Because no new inventory is being created. Because amount of usable square footage actually decreases, you technically end up with less housing than you started with.
You start with a house that comfortably fit a family of 5, to 3 condos that can only house 1 person comfortably.
I mean, you get three households instead of one. And it's more likely 2 adults plus 1.7 kids in the house vs. 3 DINKs in the condos. Which points to the other problem of upping density: families who are able to move do so
You go from 1 household to 3. In densely populated areas, single family houses shouldn't really exist because its a huge waste of space, especially in places next to public transit.