It's a non end unit townhouse with an attached garage, so the basement isn't too spacious. There is a sliding glass door leading into the grass covered backyard that's fenced in. I too thought the 4th Br would be more valuable than a 3 BR, but also wonder how many families with children prefer/need the 4th BR over a somewhat spacious recreation room. I personally would not be looking to rent out the bedroom with young children at home.
Definitely keep the 4th bedroom space, it will yield a higher sales price. Buyers can always imagine knocking down a wall but it's harder to imagine (and costs more) to build one. Light staging is well worth it and I can recommend an excellent person to you who will consult you about how to work with what you've got. Otherwise, just (very) clean and neat may just work fine. Great quality photos is key.
Please let me know if I can be of further help,
All the best,
Thanks for the question.
Does the building has a outside entrance? If it does, you can make it
an au pair or in-law suite by adding a kitchenette. Or just keep it as is,
and let them share the main kitchen.
Most buyers like to have extra bedroom and bathroom.
I am sure your unit of TH came with a higher price tag than the 3 bedrooms unit.
I would give it a nice coat of paint, stage it and sell it. Instead of putting more
money into it. If your unit is already the more expansive one among the neighbors.
p/s I am forwarding a list of for sale TH in 22201. As you can see the prices vary according to several factors, one of them is the number of bedroom and bathroom.
Also not having seen the property myself, it may depend on the design and functioning of the space to see how much value it adds over a family space; ask yourself if the bedroom, the layout, and the functionality fit the rest of the property and you'll know if it will be an asset to the home or if it just feels awkward or out of place where maybe a family/rec room should be. Good luck!