The relationship between the state and informal land development in Global South metropolises has yet not received much attention in urban studies. Concerning that knowledge gap, this paper investigates how the state regulates and inspects irregular and clandestine land subdivisions in the Metropolitan Region of Belo Horizonte (MRBH). A mixed-methods approach, focused on the inner workings of the land development control policy led by the MRBH Agency between 2009 and 2018, provides new evidence of the relationships between inspectors, developers, and prosecutors, among other actors. By delving deep into the intricate nexus between a changing regulatory landscape and the bureaucratic, street-level, and everyday enforcement practices by officials, the paper reveals how land development control, directly and indirectly, shapes informal land development in the MRBH. Particularly, it sheds light on how land development control unrolls through a contradictory combination of overregulation on one side and tolerance on the other. In light of this, I argue that, as land development control evolves without effectively tackling the land question and the structural drivers of informality, the state becomes paradoxically entangled in the production of the same forms of informality it is expected to curb. Therefore, land development control is better understood as a fragile and ambivalent state compromise between the need to regulate urban expansion and market-driven informal urbanisation. By creating opportunities for rent extraction and capital accumulation which are explored by informal land developers, the state has been crucial for property-led informal urbanisation in metropolitan Brazil.