Calculation To get **the minimum and maximum number** of residences authorized on a property, divide the lot square footage by 43,560. (square feet in an acre). The area obtained is multiplied by the general plan density range. For example, if the result is 3 to 4 homes per acre, the property can be developed according to those guidelines.

Example: A residential subdivision has 100 acres with a minimum size of 10,000 square feet and a maximum size of 30,000 square feet. The town allows for up to four residences per acre. Calculate the number of residences that can be built on the property.

Solution: First, determine the total amount of land available for development. This calculation requires multiplying the number of acres by **the average size** of an acre ($6,480). The result is 240,000 cubic yards. Next, divide the total volume of soil by the number of units to obtain the average depth of soil required for **a residential construction site**. In this case, the average depth is 20 feet. Finally, multiply the average depth of soil by the density range allowed by the general plan to determine the maximum number of residences that can be built on the property.

An acre is approximately 43,560 square feet. If each unit is 10x20, it would cover 200 square feet, thus to figure out **how many units** you might put on an acre, divide 43,560 by 200, which is 217. This is the maximum number of units that might be built on **one acre** of land.

It's very difficult to build **more than 100,000 square feet** of space in America and still remain in business because it's so expensive to do so. The cost of construction alone makes development this large impractical unless you can get a lot of people to pay you up front. In **that case**, your building will already have been paid for before it even opens **its doors**!

The number of storage units available on the market has remained relatively constant over the last few years. There are about 1 million storage facilities in the United States. Of these, only about 20 percent are considered large (more than 10,000 sq ft). Most store between 2000 and 9000 square feet. Only about 2 percent store more than 20,000 square feet.

Storage size ranges from as small as 300 square feet all the way up to larger sizes such as those found at big box stores or specialty retailers like furniture or jewelry stores.

Small storage units are perfect for holding items not worth storing permanently but that you need access to occasionally-for example, keys, that kind of thing.

Given that nothing but the land for the lots is provided, one acre (43,560 ft) is enough room to fit roughly five single-family dwellings. This is called the "buildable area" of the acre. The number of homes that can be built on an acre of land is therefore 5/0.43=12.

In practice, you cannot build more than three homes on an acre because of parking problems and other restrictions. However, four homes are possible on **a half acre**, and six homes on a quarter acre. A lot with 20,000 square feet of **living space** has enough area for 80 acres, which is equal to about 20 large blocks. In **this case**, the building density would be 6/20 or 30 percent.

An acre can also be used for farming or open space. It depends on your use intentions what kind of building you can put up on it. But in any case, an acre contains enough space for at least two small buildings. Large buildings such as schools require **larger areas**.

Building densities vary greatly depending on location, architecture, etc. But on average, we can say that an acre can accommodate between two and three small buildings. And since large buildings like schools require larger areas, an acre should be enough for several of them.

Each side of the square should be 208.71 feet long, or one acre. You may make several shapes that equal an acre by dividing the quantity 43,560 by different numbers. For example, a lot may be 150 feet on two of the four sides and 290.4 feet on the other two. This would be an area of 0.43 acres.

There are 4,760 hours in a year. If you divide the number of hours that have passed since January 1, 2012 (it's time to celebrate New Year!) by **this number**, you will know how many hours remain in the year. For example, if you divide 77,200 by 4,760, the result is 15.5, which means that 15½ hours remain until June 21, 2013 (the date when this article was written).

The Earth is estimated to be about 3.5 million miles away from the Sun. The average distance between the Earth and the Sun is about 93 million miles. So, the angle at which the Earth is seen from the Sun is about 51.6 degrees.

The Earth orbits the Sun every 24 hours at a speed of **approximately 300,000 miles** per hour. A day on Earth is therefore about 16 minutes longer than it sounds. It takes the Earth 24 hours to go around the Sun once. But because of the tilt of **its axis**, we experience night during part of **this rotation** and day during the other part.

The first diagram depicts **the average house** in 1978, when it was 1,650 square feet and located on **0.22 acres**. The second depicts its 2015 equivalent. As houses have grown larger, the lots on which they are built have shrunk—the average acreage is down 13 percent since 1978, to **0.19 acres**.

In fact, suburban sprawl has caused many small towns to disappear. Only 70 million people live in the 100 largest cities in America, but that number includes several cities with **large populations** (Los Angeles, San Diego, New York City) and others with very small ones (Rochester, New York; Greensboro, North Carolina).

The average American city once had less than 10,000 people, but now has more than 20,000. In these large metropolises, land is so expensive that only rich people can buy homes. The middle class is being pushed out of town, which causes problems for the economy and for public services such as schools and hospitals.

For example, Greensboro's population is just under 100,000 and is expected to drop further due to suburbanization. Many local businesses have closed or moved away because there are no longer enough customers to support them.

This is a problem for anyone who lives in a suburb and works in the city. It's difficult if not impossible for them to afford a place to live close to **their job**.