I've been reading Jane Jacob's book "The Death and Life of Great American Cities" for several months now (off and on) and I've been wondering what she means by blocks that are too large/long. How large is too large? Our Downtown has blocks about 230ft x 440ft, and the urban neighborhoods just outside our Downtown that have about 30 houses per block (no front yards or just a few feet between them, but have back yards) and are about 280ft x 620ft or longer. (and these are areas that have become slums and have the highest crime rates of the city, and are home to the gangs and drug dealing)
How large is too large for street safety and urban diversity?
Also, she talks about large cities, etc... However I don't know how big is medium, large etc... Since she talk about cities like Boston and NYC. My city is 400,000-500,000 people in a metro of about 2 million.