I'm a real estate agent and real estate agents are always looking for a realiable photographer to photograph houses. If you show up on time, take good photos and deliver them fast, you can make great in-school money. Standard photo package on-time should be at least $150 and the real estate agent is making plenty on the listing to pay you. Multi-image HDR is a must. You need an ultra-wide-angle for indoors (14mm I think is pretty standard even though the photos don't seem like it). The front of the house needs a 50mm for some compression without having to be a mile away from the house to take the photo, so two lenses and HDR processing and you've got an automatic money stream.
Good luck. I wish I had gotten into photography when I was 17.
I think you would find that's not wide enough for indoor real estate photos. Ultra-wides aren't so expensive usually. I wouldn't look at it as a cost. I'd look at it as an investment.