Usually this refers to a style of setting up a letter, where the text and certain other parts of the letter such as the address and salutation are flush to the left, whereas others are centred or indented.
A modified block is a style of business letter formatting where the date and closing are aligned at the center, while the rest of the content is aligned to the left. It is similar to the full block format, except for the positioning of the date and closing.
modified style
nope the 351 modified is a big block and a 302 is a small block
The date on a modified block format is one blank space below the return address.
See the link below for a sample of the modified block style business letter.
Heading, body, and closing
ÒThe modified block letter format is usually used for personal letters and informal business correspondence.
modified style
block and modified block (NovaNet)
mrs. okelley is mean
Modified block style is a type of business letter format where the date, closing, and signature block are aligned to the right. The body of the letter is left-aligned. It is commonly used in business correspondence.
In block style letters everything lines up to the left of the margin. In a modified block style everything lines up at the left except the address which appears by the right margin.
See the link below for full block and modified block style letters.