little boxes made of ticky-tacky
Little boxes, on a hillside
and they all look just the same...
- Malvina Reynolds (1962)
Also productive to consider the fate of Gaudi's housing projects in Barcelona, notably Casa Mila aka La Pedrera.
Lisbon has construction spanning from Roman times all the way to today. Most of the downtown was rebuilt after an earthquake in the 18th century.
Besides public buildings, there were a few residencial neighbourhoods and social housing built by Salazar's regime, implying that 'much of Lisbon' is his legacy is factually wrong.
Moreover the "Estado Novo" architectural style promoted by the fascist regime was meant to bring back themes from traditional portuguese construction, with a lot of masonry embellishments. This is the opposite of the monotone pragmatism of the soviet blocks.
Perhaps this is an English-as-a-foreign-language thing but to me "under Salazar" implies that the regime ordered, and payed for, most of the construction in that era which is not true.