Legal System Identification, Comparison, and Analysis Memorandum

Please first help me understand what easement is. I have looked up the definition, but still have trouble understanding what it means.

Your team is working as a legal team in a mid-size law firm. Your supervisor, a partner in the firm,
has been approached by Mr. Al Jones, a land developer and very important client, with the
following legal situation:
Mr. Jones's projects include some of the largest residential subdivisions within the City. While Mr.
Jones' business was developing the infrastructure of its newest and largest subdivision, the City
discovered an easement for a city utility line on the subdivision that did not belong to Mr. Jones.
The owner of the property where the utility easement is located also discovered the error. The
City is threatening to close down the subdivision and Mr. Jones's business, and is threatening to
sue Mr. Jones for fraud against a municipality. The adjacent property owner is also threatening to
sue the client for damages to his property and for trespassing. The adjacent property owner is a
citizen of Switzerland.

b. Your supervisor wants your legal team to identify and analyze the client's legal situation and
present to him an internal memorandum that assesses the situation and describes how the law
firm can help.
The partner wants your legal team to address each of the following:
1) Describe the state and/or federal court(s) that can review and resolve the situation. (Please address the possibility of international court considering that the other property owner is from Switzerland)
2) The court(s) that may have jurisdiction over the situation. Please Explain.