Data Parsing & Searching

Let us say you have the following data for all apartments in a locality inside a city. For this problem the city is assumed to be 
Bangalore.

{
    "whitefield": {
        "varthur": {
            "Brigade_Harmony": {
                "103": {
                    "person": {
                        "name": "Pranav Anand",
                        "email": "bharmony103@gmail.com",
                        "age": 16,
                        "job": null,
                        "company": null
                    }
                },
                "104": {
                    "person": {
                        "name": "Jikul",
                        "email": "jikul@hotmail.com",
                        "age": 38,
                        "job": "Founder - Packfora",
                        "company": "Packfora"
                    }
                }
            },
            "Sobha_Rose": {
                "101": {
                    "person": {
                        "name": "Arya Aravind",
                        "age": 25,
                        "email": "arya@arvind.com",
                        "job": "Software Engineer",
                        "company": "Akx software solutions"
                    }
                },
                "103": {
                    "person": {
                        "name": "Jackson Paul",
                        "age": 65,
                        "email": "paul_jackson@gmail.com",
                        "job": "Professor Emeritus",
                        "company": "University of Bangalore"
                    }
                }
            }
        }
    }
}

Create a logic/data structure which is able to use this data and then answer these kind of search queries.

1.  query => "/whitefield/varthur/Brigade_Harmony/" -> {"103": ..., "105": ..., "203": ...}
2. query => "//Sobha_Rose/101/person" -> {"name": "Arya Aravind", ...}
3. query => "//person[age=65] -> {"name": "Jackson Paul", "age": 65, ...}

Basically this is an XPath inspired problem but you are not supposed to use XPath or XML to solve the problem. Instead it
should be done from first principles (design from scratch).

The schema in general is,

{
	"locality": {
		"sub-locality": {
			"Apartment or Building": {
				"flat number": { 
					"person": {
						"name":
						"email":
						"age":
						"job":
						"company":
					}
				}
			}
		}
	}					
}