Name: 5' x 5' Self Storage Unit at modSTORAGE (ex-21CSS) - 3503 B ST - Philadelphia
Brand: modSTORAGE (ex-21CSS) - 3503 B ST - Philadelphia
Price: 9.99 USD
Availability: InStock

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modSTORAGE (ex-21CSS) - 3503 B ST - Philadelphia

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3503 B StreetPhiladelphia, PA 19134

(512) 361-1686

4.5(20)

4.5(391)

Key Features

On-site office

Video cameras on site

Fenced & Lighted

Climate controlled units

Drive-up access

Totally FREE Move In

5x5 Locker$0.4 / sqft

Roll Up Door
Climate Controlled
Interior

$14.99$9.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x5 Unit$0.8 / sqft

Roll Up Door
Climate Controlled
Interior

$34.99$19.99ONLY 2 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x5 Unit$0.88 / sqft

Roll Up Door
Climate Controlled
Interior

$37.99$21.99ONLY 3 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x5 Unit$1 / sqft

Roll Up Door
Climate Controlled
Premium Location
Interior

$39.99$24.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x7.5 Unit$0.93 / sqft

Roll Up Door
Climate Controlled
Interior

$59.99$34.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x10 Unit$0.9 / sqft

Roll Up Door
Climate Controlled
Interior

$79.99$44.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x10 Unit$1 / sqft

Roll Up Door
Climate Controlled
Interior

$84.99$49.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x10 Unit$1.1 / sqft

Roll Up Door
Climate Controlled
Premium Location
Interior

$94.99$54.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x10 Unit$1.6 / sqft

Roll Up Door
Drive Up Access

$139.99$79.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

6x10 Unit$1.25 / sqft

Roll Up Door
Climate Controlled
Interior

$129.99$74.99ONLY 1 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

6x10 Unit$1.5 / sqft

Roll Up Door
Drive Up Access

$159.99$89.99ONLY 1 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x15 Unit$0.51 / sqft

Roll Up Door
Interior

$64.99$37.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

7.5x10 Unit$0.53 / sqft

Roll Up Door
Interior

$69.99$39.99ONLY 1 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

7.5x10 Unit$1.07 / sqft

Roll Up Door
Climate Controlled
Interior

$139.99$79.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x15 Unit$1.09 / sqft

Roll Up Door
Climate Controlled
Premium Location
Interior

$144.99$81.99ONLY 2 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

7.5x10 Unit$1.09 / sqft

Roll Up Door
Climate Controlled
Premium Location
Interior

$144.99$81.99ONLY 1 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

5x15 Unit$1.27 / sqft

Roll Up Door
Drive Up Access

$169.99$94.99ONLY 3 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x10 Unit$0.4 / sqft

Roll Up Door
Interior

$84.99$39.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x10 Unit$0.75 / sqft

Roll Up Door
Climate Controlled
Interior

$159.99$74.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x10 Unit$0.85 / sqft

Roll Up Door
Climate Controlled
Premium Location
Interior

$169.99$84.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x15 Unit$0.57 / sqft

Roll Up Door
Interior

$149.99$84.99ONLY 1 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x15 Unit$0.67 / sqft

Roll Up Door
Climate Controlled
Interior

$174.99$99.99ONLY 1 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x15 Unit$0.8 / sqft

Roll Up Door
Climate Controlled
Premium Location
Interior

$194.99$119.99ONLY 2 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x15 Unit$1.33 / sqft

Roll Up Door
Drive Up Access

$314.99$199.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x18 Unit$0.69 / sqft

Roll Up Door
Interior

$199.99$124.99ONLY 2 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x18 Unit$1.61 / sqft

Roll Up Door
Drive Up Access

$404.99$289.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x20 Unit$0.67 / sqft

Roll Up Door
Interior

$214.99$134.99ONLY 1 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x22 Unit$1.39 / sqft

Roll Up Door
Drive Up Access

$424.99$304.99ONLY 2 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

15x15 Unit$0.91 / sqft

Roll Up Door
Interior

$319.99$204.99ONLY 1 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x25 Unit$0.86 / sqft

Roll Up Door
Interior

$326.99$214.99ONLY 1 LEFT!

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x27 Unit$1.41 / sqft

Roll Up Door
Drive Up Access

$529.99$379.99

Reserve Now, Pay Later

You will not be charged until move-in

Totally FREE Move In

10x30 Unit$1.33 / sqft

Roll Up Door
Drive Up Access

$554.99$399.99

Reserve Now, Pay Later

You will not be charged until move-in

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Facility Overview & What to Expect

About modSTORAGE (ex-21CSS) - 3503 B ST - Philadelphia

Welcome to modSTORAGE (ex-21st Century Storage) in Philadelphia, nestled between Fishtown and historic Kensington. We're soon upgrading to the NOKE by Janus system for unmatched security. Perfect for locals and businesses, our climate-controlled units cater to all storage needs.

Enjoy our amazingly low web rates, underscoring our commitment to affordable storage. We stand out with flexible payment options and a customer-first approach. Our loyalty program offers extra value for our long-term patrons.

Situated minutes from Fishtown and Kensington, discover why we're Philadelphia's top choice for storage. Secure, convenient, reliable - come experience the difference with us.

Visit near B St and E Allegheny Ave, by the Delaware River, for your clutter-free journey."

OFFICE HOURS

Sunday	9:00 am - 4:00 pm
Monday	9:00 am - 6:00 pm
Tuesday	9:00 am - 6:00 pm
Wednesday	9:00 am - 6:00 pm
Thursday	9:00 am - 6:00 pm
Friday	9:00 am - 6:00 pm
Saturday	9:00 am - 5:00 pm

ACCESS HOURS

Sunday	6:00 am - 4:00 pm
Monday	6:00 am - 6:00 pm
Tuesday	6:00 am - 6:00 pm
Wednesday	6:00 am - 6:00 pm
Thursday	6:00 am - 6:00 pm
Friday	6:00 am - 6:00 pm
Saturday	6:00 am - 5:00 pm

Verified Customer Reviews

Verified (20)

Google (391)

Great experience!

I am so pleased with my experience here at 21st Century! Millie was so patient and helpful in guiding me through both storage rental and U-Haul rental! She made the move in a big city more pleasant for this country girl! I would definitely use this facility again!!!

modSTORAGE (ex-21CSS) - 3503 B ST - Philadelphia

Deb Barrt

Jul. 31, 2019

The customer service was outstanding. I had my son with me and the general manager and clerk where very warm and extremely helpful with him while I was signing paper work. The facility is super clean and it's very convenient to gain access into your storage unit.

modSTORAGE (ex-21CSS) - 3503 B ST - Philadelphia

Elizabeth Wardlaw

Jan. 5, 2016

slum storage

First off 2 people that would there are just plain dishonest. Millie will lie through her teeth to get you to rent there. I was told that she would lock me into the rate for two years if I stay long term..... Yeah right. 6 months into it boom 1st increase.WITH NO NOTIFICATION. Now onto the idiot that is the Manager there all you hear from him for about 18 months is that they are working on fixing the leaks.. It's like a cave in the place on the lower level.... mold, slime cicles growing on the ceilings... how do they fix it???? Buckets.... who which the lovely class of people that rent there use for bathrooms. I have seen bowel movements in these buckets tgat stay there for weeks. Beware L&I have been notified and also the BBB.... crooked to the core.

modSTORAGE (ex-21CSS) - 3503 B ST - Philadelphia

Steve Blair

Aug. 1, 2015

Newer Older

February 4, 2026

PROPERTY DAMAGE & DISGUSTING LIQUID ALL OVER MY STUFF. PLEASE SEE ATTACHED PICTURES OF DAMAGED BELONGINGS. DO NOT USE MODSTORAGE. ALSO TERRIBLE CUSTOMER SERVICE. Within just 2 months of storing my belongings here, my mattress and clothing were soaked in a FOUL SMELLING LIQUID. It has been 30 DAYS since requesting reimbursement for the damaged items, and every email and follow-up has been completely ignored. This has caused hardship and inconvenience as the entire reason I rented a storage unit was because I would not be in the area. Now I have to go through extreme inconvenience to get there again just because of this this damage. The employee that was on-site the day I discovered the the damage would not commit to any solution or take responsibility and and only told me to send an email, which the email has led nowhere. SEE ATTACHED PICTURES OF DAMAGED BELONGINGS

January 23, 2026

Jim and Fern at MyStorage provided excellent customer service during my U-Haul truck rental on January 14th. They were professional, friendly, and made the process smooth and stress-free. I truly appreciated their help and would highly recommend this location because of them.

November 2, 2025

Great experience the guy help us a lot everything went smoothly

May 14, 2025

I came in with some apprehension and Fernando was very attentive even between handling back to back phone calls. Had prompt, clear answers for my questions and was thorough with the initial walk through. I didn’t feel pressured into an upsale, he seemed genuinely interested in ensuring they accommodated my specific needs. Hoping the facility service holds up to the customer service standard set.

July 11, 2025

The first day going the guy was very nice but now that I’ve been there for only four months, they raised my payment and when I asked him why he was very rude and said “because we can do that”. He has no customer service skills what so ever. I did go a couple of time to pay my unit and saw how he treated other customers. This business will not last long with him being there. I do not suggest anyone coming as long as he is there.

View all reviews on Google

How Renting a Self Storage Unit Works

There are two time-saving ways to rent self storage space at this facility:

Reserve your unit online today and head straight to your unit on move-in day.
Reserve for free with no payment required until you sign your lease on move-in day. Lock in your rate without even entering your credit card information.

How It Works

Pick your self storage unit

Reserve online with us for free

Cancel or update anytime, no strings attached

Visit your facility

Move in and get organised!

Find Self Storage Near You

modSTORAGE (ex-21CSS) - 3503 B ST - Philadelphia

Key Features

Facility Overview & What to Expect

Facility Description

Security & Property Protections

Access & Office Hours

Vehicle Storage & Property Coverage

Payment, Billing, & Rental Policies

Premium Services

Verified Customer Reviews

How Renting a Self Storage Unit Works

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