Petrescu was the principal architect of Nicolae Ceausescu's People's Palace, the world's second largest building, which cost several billion dollars and replaced a substantial part of the city's historic centre.
Petresku je bila glavni arhitekta Narodne palate Nikolaja Čaušeskua, po veličini druge zgrade na svetu, čija je izgradnja koštala nekoliko milijardi dolara i koja je zauzela znatan deo istorijskog gradskog centra.