Row house plans derive from dense neighborhood developments of the mid 19th century in the US and earlier in England and elsewhere. Manhattan and Boston streetscapes boast some famous examples. Some row houses are freestanding and while some have common walls. Modern row house plans combine front and/or rear porches with garages below or at the back and open layouts on the main floor. Row house plans (sometimes referred to as "row house designs" or "row house floor plans") can be an especially practical choice when building in an urban setting, or any location where land/lot space is extremely limited.