BOROUGH PARK - Residents of one Brooklyn neighborhood say the unprotected vacant homes on their block are providing shelter for the homeless and negatively impacting the neighborhood.Neighbors say the homes at 1037 and 1039 East 42nd Street are supposed to be vacant. However, the owner of the property has not boarded up the houses properly, leaving them open for unwelcome guests and potential danger. Residents say a fire was started in one of the homes recently by a group of homeless people taking shelter inside. They say there are dozens of shelters for the homeless and the recent problem is unnecessary.Neighbors say the owner of those two properties, Miriam Aber, has recently purchased five more houses on the street. They fear the problem will only get worse if the city does not step in to in force Aber to secure the properties.