You're not like other monks, you weren't trained or raised on a misty mountain top with all the time in the world to hone your body and skills-the world was your gym and the street your trainer. 

Street Smarts

The street was your monastery, your home, and your master, when you take this subclass as third level, you may use Wisdom in place of the normal ability score for ability checks on Investigation, Deception, and Intimidation checks.  Additionally, you know Thieves Cant.

Street Fighting

At third level, you gain proficiency with improvised weapons, these weapons do your martial arts die one step up for damage. So if your martial arts die is a 1d4, they would do a 1d6, and so on. Improvised Weapons are treated as monk weapons for you, and as such, you can use your Dexterity to make attacks with them. Whenever you make a grapple or shove attempt, you gain a bonus to the check equal to your Wisdom Modifier.

One to the Chin

By sixth level, you know how to take a beating better than any other monk and can get back up no matter how hard the blow. You gain two extra hit points per monk level. 

Additionally, if you a creature ever causes you to be knocked prone, you can use your reaction to stand back up.

Sixth Sense

 At eleventh level,  if you spend at least one minute interacting with or studying a creature, you can tell if the creature is armed, what their alignment is, and how much gold they are carrying. Additionally, as an action, you can make a DC:15 insight check to gain advantage on your first weapon attack against a target and give them disadvantage on their next weapon attack on you.

Kick ‘em While They’re Down

At seventeenth level, if a creature within 5ft of you falls prone, you can use your reaction to make an unarmed attack against that creature. Additionally, if you have advantage on an attack, you can add your Wisdom Modifier to the attack roll.