Which of the following is best organized as a partnership?

A partnership is a business owned by two or more individuals who share the profits and losses of the business. Therefore, the best organized business as a partnership would be the "Designing and building of houses" as it is a service-oriented business that typically requires a small team of professionals working together, sharing profits, and making decisions. The other options mentioned in the question involve larger capital requirements, complex production processes, and require more significant investment, making them more suited to other forms of business organization such as corporations.