This is not universally true, and it's pretty common to hear people who moved out to the suburbs hate it, but they needed the third or even second bedroom! Slightly larger condos simply didn't exist on the market, or were priced at astronomic rates (double the $/sqft compared to a 1bd unit).
Looked at a dozen midrise buildings this year across DC/Phila/NYC markets, some new/recent construction, some office conversions. Most buildings had zero 3bd units except for maybe a single penthouse, a 2bd unit every other floor, and the entire rest of the building evenly divided between studios and 1bd units in the 400-600sqft range. The competition for the 2bd units was unreal, in several cases people were offering the entire year's lease upfront, in cash, to secure an apartment.
It really is that competitive and the demand is there, the supply is not.
Looked at a dozen midrise buildings this year across DC/Phila/NYC markets, some new/recent construction, some office conversions. Most buildings had zero 3bd units except for maybe a single penthouse, a 2bd unit every other floor, and the entire rest of the building evenly divided between studios and 1bd units in the 400-600sqft range. The competition for the 2bd units was unreal, in several cases people were offering the entire year's lease upfront, in cash, to secure an apartment.
It really is that competitive and the demand is there, the supply is not.