Modern Apartment Design, The Remodeled Building by A-Cero. Here are some modern interior design that we serve. An old building that had been renovated into eight apartments. The building is located in Madrid. It has a modern interior space and comes complete with some furniture of modern style. Design elements that are designed with quality, comfort and luxury. Interior finish designed by a company A-Cero Spanish architecture. Now this building is the design of the new reformed luxurious apartment. The flat is placed in an old four-story building. These apartments are already leased before it was fully equipped. At every level in this apartment are two houses with a surface larger than 185 square meters. The penthouse is the largest house in the building and they are two flat floor.