Md. Code, Tax - Property § 8-101

(a) For assessment purposes, property shall be divided into classes and subclasses.

(b) Real property is a class of property and is divided into the following subclasses:

(1) land that is actively devoted to farm or agricultural use, assessed under § 8-209 of this title;

(2) marshland, assessed under § 8-210 of this title;

(3) woodland, assessed under § 8-211 of this title;

(4) land of a country club or golf course, assessed under §§ 8-212 through 8-217 of this title;

(5) land that is used for a planned development, assessed under §§ 8-220 through 8-225 of this title;

(6) rezoned real property that is used for residential purposes, assessed under §§ 8-226 through 8-228 of this title;

(7) operating real property of a railroad;

(8) operating real property of a public utility;

(9) property valued under § 8-105(a)(3) of this subtitle;

(10) conservation property, assessed under § 8-209.1 of this title; and

(11) all other real property that is directed by this article to be assessed.

(c) Personal property is a class of property and is divided into the following subclasses:

(1) stock in business;

(2) distilled spirits;

(3) operating personal property of a railroad;

(4) operating personal property of a public utility that is machinery or equipment used to generate electricity or steam for sale;

(5) all other operating personal property of a public utility;

(6) machinery and equipment, other than operating personal property of a public utility, that is used to generate:

(i) electricity or steam for sale; or

(ii) hot or chilled water for sale that is used to heat or cool a building; and

(7) all other personal property that is directed by this article to be assessed.