4LDK apartments typically range from 80 m² of space to as much as 200 m² of space or more. On average, a 4LDK unit in Tokyo and Yokohama is about 80 m² to 130 m², has a separate toilet and bath, kitchen with a 3-burner stovetop, 1 larger bedroom and 3 smaller bedrooms, a larger balcony, and a dressing room/washroom with a large vanity that has two sinks, and a space for a washing machine. The vast majority of older and newer 4LDK units have at least 1 tatami mat room, the other 3 bedrooms have flooring. Newly built 4LDK units may have a walk-in closet in the larger "master bedroom" with direct access to the balcony from that bedroom and maybe some of the other bedrooms as well.

4DK units are not very common and tend to be found in older buildings in more suburban or rural areas. Nowadays, a typical 4DK unit is refurbished and remodeled for renting out as a 3LDK unit.

A typical tenant is a married couple with children (often teenagers) and may be larger enough to accommodate  larger furniture from overseas. However, the small bedrooms are typically much smaller with the sole intent of providing a private room for each child. 4LDK units are popular among the foreign community who have kids and need to be close to the city center for accessing work and international schools. 

A 4LDK is often a permanent home that offers many more conveniences in terms of access while often having more space and many nice amenities (garage parking, concierge, etc.) compared to a newly built house in the suburbs. 

Buyers of this type of property often buy this property as a permanent home until retirement and may sell the condo to finance a larger house in a more rural area closer to greenery, fresh air, the sea, etc.