Nuevo Baztán, Madrid
Definitely seems to be a "genuine" Former T List.
Appeared on Spain's T List July 97 and disappeared in 2001.
Nothing anywhere near it now.
Interesting to consider Why it might have been thought to have OUV. Possibly as an example of an Industrial planned town - "The historic centre was designed as an industrial and housing complex laid out on a grid plan. It was promoted and developed by the prominent politician and publisher Juan de Goyeneche (1656–1735)"
Or alternatively for its Palace - "The Goyeneche Palace in Nuevo Baztán, Community of Madrid, Spain, is an eighteenth-century palace with a linked church. It was designed by José de Churriguera, an architect known for a profusely decorated style known as Churrigueresque. The church's interior is an example of this style."
Site Pittoresque de la Cote Nord-Ouest = Maybe Serra de Tramuntana ?
The 1996 T List is in Spanish and it has an entry"48 Paraje pintoresco Costa NO Mallorca
" - so it looks as if your guess about Serra de Tramontana for this in French as it was later entered was correct! (NO = noroeste presumably )