The school occupies a former nineteenth-century resort hotel that was designed by Victorian architect Frank Furness, a landmark of the Philadelphia Main Line.

[citation needed] The second Bryn Mawr Hotel was designed by Furness, Evans & Company and was built between 1890 and 1891.

It is a five-story, L-shaped, stone-and-brick building that was created in a Renaissance Revival / châteauesque style, and features a large semi-circular section at the main entrance, topped by a conical roof and finial.

[9] In 1896, The Baldwin School began leasing the Bryn Mawr Hotel during the winter months for use as a dormitory for its boarding students.

Today the school has made many additions to "The Residence," but maintained the general style of the original building.

It is now used for dining, art studios, theater performances, housing, the Middle School, and an Early Childhood Center.

The B-flats have won the Ardmore Rotary in 2022, 2023, and 2024 The Baldwin School competes in the Inter-Academic League, most commonly known as the Inter-Ac.

Interscholastic varsity sports are: Basketball, Cross-Country, Field Hockey, Golf, Lacrosse, Rowing, Soccer, Softball, Squash, Swimming and Diving, Tennis, Volleyball, and Indoor Track.

Each class regularly consists of a couple nationally ranked squash players, many of whom compete internationally across Europe, Canada, and South America.

Many of these players are also among the strongest academically at Baldwin, earning honors including National Merit and induction into the Cum Laude Society.