> or recently

Right but 'recently' is relative. To me 1960s is recently. That's when people started building 'modernly'. But I guess not for you?

In Australia, before 1940s or so might be "character", 1960s might be "conventional" (said generally with distaste) and recent/new might be 2005+. Character houses are usually improved (with a matching or contemporary extension) and conventional houses are often demolished.

Character example with contemporary reno but garish fitout (antlers!): https://www.realestate.com.au/property-house-sa-highgate-136...

Conventional - you can see from the second photo being a top-down, they expect people to buy and demolish: https://www.realestate.com.au/property-house-sa-clapham-1364...

New build on half a block - common here to buy, sub-divide the block, and build two semi-detached or two-storey homes: https://www.realestate.com.au/property-house-sa-myrtle+bank-...

If modernly is cheaply, yes 1960s.

If modern is dual pane windows, proper insulation, mixed use, multiple stories... this is still quite rare in California and only allowed to become common in new buildings ten years ago due to nimbys blocking any new development.