What are the opening hours?

Monday 2:30pm - 6pm Tuesday 2:30pm - 6pm Thursday 2:30pm - 6pm

Building Twentyone

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Building Twentyone

Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from Building Twentyone, Nonprofit Organization, 1288 N Cedar Road, Mason, MI.

Building Twentyone empowers teens to discover passion and purpose by providing a safe, engaging space where they can grow in leadership, life skills and community connection before the age of 21. With after school drop-in space equipped with laptops, foosball, ping pong, game systems and programs designed by and for teens, we are passionate about creating a fun atmosphere with hands on learning and experiences set in safe and creative environment.

06/04/2026

Today is the LAST DAY of After School Open Space!! 📣

What a bittersweet day! We've had an amazing school year with your students, and we're so grateful to have been a part of their journey. Thank you for trusting us with your kids and for making this year so special.

We hope you all have a fun, safe, and memorable summer! Be sure to join us for our Hangout Days and Summer Programs—we'd love to see you there! ☀️🎉💙

06/02/2026

We have tons of fun things coming up for Building Ninja!!❌📣🎉

Lil' Ninjas Preschool Open Play is for 2-5 year olds. Cost is $10 per child or $25 per family.

Family Day is also THIS SATURDAY for all ages! Cost is also $10 per person or $25 per family!
More Info. HERE: https://buildingtwentyone.org/openplay/

Summer Camps are also approaching quick!! Make sure to enroll your 6-18 year old before it's too late. Registration for our first week of camps end next Wednesday, June 10th. We have both Full Day & Half Day options available.
More Info. HERE: https://buildingtwentyone.org/ninja-summer-camps/

06/01/2026

Looking for fun and creative summer activities for your 6th–12th grader?☀️

Don't miss our Candle-Making & Watercolor Workshop on Tuesday, June 23rd with The Craft Bar! We also have a variety of other engaging programs throughout the summer for teens to explore, create, and connect.

You must enroll 1-2 weeks before the program start date depending on the program. Check out our website and get registered today!
https://buildingtwentyone.org/summer-programs/

05/28/2026

Spend the afternoon hanging out at B21 with your friends—or come on your own and meet some new people!📢🤩☀️

We’ll have free snacks, plenty of games, and more.
These hangouts are included in your $25 Summer Membership and take place on the Mondays listed below from 1:00–5:00pm. Students may arrive as early as 12:30pm. We'll go the beach, run around our new ninja gym, and more!
All attendees must be 6th-12th grade in the 2026-2027 school year and registered for Summer Membership.

Hangout with us this summer and register below:
https://buildingtwentyone.org/summer-programs/

05/27/2026

Last Day of B21 Open Space is next Thursday, June 4th!! 📣

We have had an incredible year with your student!
Thank you for allowing us to be apart of your teens story this past school year. We hope to see you again this summer for our programs and hangout days!

We will reopen our After School Open Space in the fall on Tuesday, September 8th.

05/26/2026

Welcome to Building Ninja summer camps! 🤩
Enjoy different themes each week.

You ninja will be sure to have a blast, learn new skills, and make new friends!
Your kids will LOVE our summer camps, we’re all about building strength, agility, self-confidence and continuous improvement… all while having a blast!

Ready to get started? Enroll your 6-18 year old today👇
https://buildingtwentyone.org/ninja-summer-camps/

05/21/2026

The summer lineup!! 👀📢🤩

Rollercoasters, Candle-Making, Clay, Kayaking, Cooking, and MORE!!
This summer is one your 6th-12th grade student won't forget. We've partnered with some incredible businesses like The Craft Bar , Lansing Shuffle, River Town Adventures and Bradly's HG to provide the highest quality programs for your teen. We know sometimes activities for youth can be limited, so we wanted to make sure to provide unforgettable experiences with incredible facilitators for your student!

Sign up for Summer Membership at the link below:
https://buildingtwentyone.org/summer-programs/

05/19/2026

We are heading to Cedar Point on Monday, June 15th!!🎢🤩🎉

The deadline to register is TOMORROW!!
As a reminder, we will depart from our facility at exactly 6am and return around 1am. The $105 cost includes your ticket, transportation, and a food and drink pass for the entire day.

Get your 6th-12th grade registered today before it's too late! Follow the steps at the link below👇
https://buildingtwentyone.org/summer-programs/

05/18/2026

Building Ninja Summer Camps are almost here!!📣🤩

Looking for an exciting way to keep your 6-18 year old active this summer? We’re offering both Full Day and Half Day camp options for students in the greater Lansing area! This summer only, we’re celebrating with special Grand Opening pricing — so now is the perfect time to sign up. Each week will feature a unique theme, making every camp experience fresh, fun, and unforgettable!

Register your ninja today!👇
https://buildingtwentyone.org/ninja-summer-camps/

05/15/2026

Did you know we have a lake out back of our building?! 🌊🐢☀️

Our space is uniquely placed by a lake and off of a main road so everybody can get to it easily.

Come see it for yourself by booking a tour. Your 6th-12th grader will love it! We have Hangout Days coming up each month this summer for your teen to connect with others in our space as well as some fun trips to the park and beach.

Click below for more info:
buildingtwentyone.org/summer-programs

Address

1288 N Cedar Road
Mason, MI
48854

Opening Hours

Monday	2:30pm - 6pm
Tuesday	2:30pm - 6pm
Thursday	2:30pm - 6pm

Telephone

+15178895103

Website

http://www.buildingtwentyone.org/

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