children and to protect nearby real estate properties not tied to the industry from devaluation. These are known as "secondary effects". The validity of secondary effects has been disputed, with the counterargument that clubs have been forced through zoning into "seedy neighborhoods". Elsewhere in North America, the Zona Norte red light district in Tijuana, Mexico, has a number of legal brothels which are modeled on strip clubs and feature U.S.-style striptease performed by its prostitutes. Facilities Most strip clubs are located in buildings that are converted bars, restaurants, or warehouses, or had industrial uses. The original layout of the building will affect the physical layout of a club. The more money that has been invested in a facility, the more it resembles a dedicated club. Regardless of the floorplan, as interactive theater, there are features every strip club will have. They include: performers (strippers), a floor area where the customers will congregate, and some form of staging for the striptease performance. Higher-end gentlemen's clubs have features that cost millions of dollars to install and maintain. General admission areas The floor area is open for general admission. A customer is free to wander around the club, except for employee areas and premium lounges. To access premium lounges (sometimes called VIP, champagne, or other lounges), a customer would normally be charged a fee above the cover charge. In some cases, the employee and premium lounges are dual use. For example, a manager's office might also double as the VIP room. All clubs are configured differently. A small club can have a single room, with an improvised stage for the striptease show. Many clubs have more than the basic amenities. Larger clubs have clearer designations of areas. The different areas within a club could be separated by a physical step, built-in railing, platforms and levels, doorways, distinct rooms, and entirely separate floors, and they can also be formed by different carpeting, placement of seating, or physical implements such as a rope or other physical marker. Floor and seating Most entertainment takes place in the main floor area, and this is where performers and staff can interact with patrons. Customers get comfortable in this area and from their observations, they decide which club services they will use. The main stage is visible from the main floor, and the main bar is accessible, if one is present. Patrons can usually select from open seating and