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.
Petrescu je bila glavna arhitektica Narodne palače Nicolae Ceausescua, po veličini druge zgrade na svijetu, čija je izgradnja koštala nekoliko milijardi dolara i koja je zamijenila velik dio povijesnog gradskog središta.