SAN FRANCISCO (KRON) – San Francisco’s city attorney is suing the owners of a property that’s become a danger to the public. City officials had first issued notices and fines to the owners, but since they got no response, they are taking legal action. The property is essentially a large pond filled with algae and trash. Neighbors have been trying to make light of the situation — putting up signs saying “Warning, no lifeguard on duty.” But the area is also causing major safety concerns, and that’s why it is now at the center of a lawsuit. Could 24 hour ‘pit stops’ make SF streets cleaner? Homeless advocates say yes Tsai walks her dog every day by this property on Shipley Street in the South of Market neighborhood. She says several neighbors have expressed concerns to the city about the property accumulating water and trash for about a year. "Big concern is mosquitoes. They can carry a variety of diseases, and (I) hope that we're not getting anything from that,” said Crissy Tsai, who lives nearby.  Bal KC owns nearby store Harvey’s Place. He says he gets constant mosquito bites working next door from the “lake.” San Francisco City Attorney David Chiu is suing the owners of this property, saying it endangers the safety and health of the public. "Subjecting the neighbors and nearby residents to a blighted parcel of land filled with very large ponds of standing water, mosquito infestation, graffiti, overgrown vegetation, piles of trash,” Chiu said.  Several companies are listed as the owners in the lawsuit. It states they purchased the vacant lot in 2018 to build an eight-story building with 127 housing units, but construction came to a halt during the pandemic. "I remember they were pumping for months up here. They had pumps going, and then they decided they weren't going to develop it and gave up,” said another man who lives nearby, named Keith.  Chiu says the owners have violated local and state safety codes. Four city departments have issued code violations and fines, adding up to more than $1 million. Notices are taped to the gate. “To get the owners to address the issues at the site, including ordering them to drain the water from the vacant lot,” Chiu said. “But they have been unresponsive. So our hope with the lawsuit is that a judge will step in and get these property owners to comply with their legal obligations." Neighbors wonder how much longer this will go on. Chiu thinks a judge may force the owners to sell the property.  KRON4 reached out to one of the main companies that owns the land but did not hear back in time for this report.