Though there is no public listing of boarded-up homes in the Town, finding the owner of the property would give you the ability to contact that person/entity. If you are trying to find out who owns a specific property, but you do not have an exact address, such information is available by filing a Freedom of Information Request in the Town Clerk's Office, (631) 957-4291, which is located in Town Hall, 200 E. Sunrise Highway, Lindenhurst.
However, in the case that you do have a specific address, the owner of a specific property can be found by using the computer system in the Assessor's Office, (631) 957-3014, in Town Hall.
Once the owner of the property is found, you would have to contact that individual owner to inquire about the property further.