Letter Layout
Almost every company has its individual preference on how it wishes its letter arranged, how the inside address will be typed, and what particular format will be used in the layout of the entire letter.
Business letters are usually arranged in one of the letter styles described briefly below
Full-Block Form
It is less appealing to those who prefer "block form" and "semi-block form" because the same left margin is used for every line. They say that this style lacks symmetry. (See Example 1 on page 17) However, nowadays this letter style is becoming very popular especially when used with no punctuations because it is the fastest to type (see example 2 on page 18)
Block Form
To most readers block form is appealing because it achieves the best visual balance in the page. The inside address and the salutation in the upper left corner match almost perfectly the close and signature in the lower right
Semi-Block Form
It is equally popular with block form because its paragraphs are indented as those of books, newspapers and magazines are