While all McMansions are Builder Specials, the derisive term Builder Special is reserved for a pedestrian home placed in a neighborhood of unique homes, whereas McMansions are often clustered together in a subdivision of McMansions.
Often in place of a wooded area that contains irreplacable diversity in it's flora and fauna, The builder will select a generic assortment of bushes, trees, and other plants. These will typically include the short lived Bradford Pear, Red Maple, Pin oak (both native to marshy areas), Burning Bush, Japanese Barberry (both considered invasive), various Junipers & arborvites, Korean Boxwood, and whatever other generic plants they have to choose from at places like WAL-MART, Lowes, Home Depot, K Mart and Target.
This is even the case around 2 million dollar McMansions.
This is one of the reasons why suburban sprawl is so damaging and why it disrupts the delicate ecological balance.
The builders special can also be seen around commercial development.