Landscaper Lottie used her machinery, employee labor, and her expertise to landscape Opal's new guest home. Opal fails to pay for the landscaping because she has run out of money. Lottie files a lien against the real property. This lien is called

Mechanic's lien

Explanation:

 The mechanic's lien is basically refers to the workers where they perform the mechanics related work for understanding the properties and it is the legal claim for the purpose of improving the material.

It is basically managing both private and the real properties and managing the security interest.  

According to the question, the Lottie is filing lien against the property and this lien is known as the mechanic's lien as the opal is not able to pay for landscape.      

  Therefore, Mechanic's lien is the correct answer.

answer; private store;