Inside your Home or Apartment, or inside your Garage!!
I do know some people who just chain and padlock their bicycle on their back porch or on their back deck.
They will bring it INSIDE when the weather forecast calls for extented Rain.
Things will work better, and remain in the best condition IF YOU STORE YOUR BICYCLE INDOORS WITHIN A CLIMATE-CONTROLLED ENVIROMENT. An unheated garage or fully enclosed locked shed is not as good perhaps as a home's basement (assuming no basement flooding issues..).
What the heck is the problem with getting a HEAVY bicycle Inside Your Home or Apartment.......... The bicycle has wheels and STAIRS are STAIRS....the individual stair risers aren't too high and generally stairs aren't too steep (they surely can be though..). Just as the Coca-cola and Budweiser and Miller Beer ROUTE SERVICERS have to Use Ordinary HAND TRUCKS to get up the stairs at bodegas, Convenience Stores, Restaurants, Bars, etc.............YOU CAN CERTAINLY ROLL A 55 pound BEACH CRUISER UP ANY STAIRS, ONE STEP AT A TIME, Rolling It.....NOT FULLY CARRYING ALL 55 POUNDS FREE OF THE STAIRCASE!! Many 83 year old Grandmas can do it, as they know how to roll it, one step at a time.
Now if you live in a tiny efficiency studio apartment that is just about twice the size of a Port-O-Let, well then you might need to LIMIT your bicycle collection to just one bicycle. You've got to be realistic as you can't be one of those horder types if your're residing in a 1 bedroom efficiency. Like everything else, you probably want to have realistic priorities, otherwise your spouse, guests, and family may begin to have issues with you. Get it together and be able to afford the necessary 'space' needed to both live comfortably and properly contain and store your collection, AND skip acquiring any more until you can move in to a much larger, better equipped, living arrangement. Maybe that means saving money and focusing on getting a higher paying job with better wage/raise prospects in the near and long-term future, instead of collecting more that you cannot store! If you choose to ignore all of what I just suggested and where you currently reside has a backyard of some kind and the neighbors wouldn't mind one of those Harbour Freight type of One-Car Sized portable garage made with aluminum frame tubing and Tent Material that is tarp like that fully covers with a roof and four sides.................often Harbour Freight has such a deluxe One-car garage on sale for less than $389. You likely could store plenty of bikes and other junk inside of that Harbour Freight thing. Just remember that the fun part of Bicycling is having the time to get out and ride your bike(s). If you're constantly managing junk like Fred Sanford, where that takes most all of the time that you could devote to actual riding, well then it is my opinion that you're doing it the wrong way. Fred Sanford or Fred Bikerider, it really is difficult to do both.