similar elements among them. Many States distinguish between the types of real property upon which a mechanics lien can be filed. Under the principle of sovereign immunity, real property of the government (public property) is ordinarily not subject to the claims of private parties. Therefore, unless the state specifically so provides, mechanic's liens do not attach to the title owned by the state or its administrative subdivisions, such as cities. Similarly, mechanic's liens under state law are invalid on federal construction projects. To protect subcontractors and suppliers working on federal projects where the contract price exceeds $100,000.00 the Miller Act requires general contractors to provide a payment bond which guarantees payment for work done in accordance with the terms of the contract. Many state and municipal governments similarly require contractors on public works projects to be bonded under so-called "Little Miller Acts." Theoretically, the payment bond under the Miller Act or Little Miller Act stands in place of the government's property, and qualified claimants make claims against that bond similar to how they would file an ordinary mechanic's lien. In many states, the legislature has created extra procedures in order for a mechanics lien to be placed on residential property. In New Jersey, which enacted the strictest of these regulations, a mechanics lien can only be placed on residential property after a Notice of Unpaid Balance and Right to File Lien has been filed within 60 days of the lienor's last date of work and an arbitration award has been issued by an American Arbitration Association arbitrator permitting a mechanics lien to be filed. The act itself of filing a mechanics lien can be difficult. Most States simply require the filing of the mechanics lien with a county or court clerk within a defined amount of time from a triggering event. However, Maryland requires an application to the Court in order to file a mechanics liens. In Maryland, corporations must hire an attorney to make an application to the court. Creation and perfection Under the statutes, the lien is usually created by the performance of labor or the supplying of material that improves the property. Just what type of contribution counts as a valid basis for a mechanics lien varies, depending on the particular state statute that applies. Some common examples are: laborers, carpenters, electricians, mechanical/HVAC contractors and plumbers working on the project site; lumber yards, plumbing supply houses and