Kyle,
Sometimes the worst reason that people build a facility is that they already own the land. Self-storage has gotten a lot of press in the last few years and for good reason. The first thing to do is to get a feasibility study. If you are going to get a loan to build it, the bank should require one...we do for many reasons.
The costs of building the facility can vary greatly. your local zoning and permitting can tell you how many sf can fit on a piece of land and it will depend on your FAR (floor area ratio). a good rule of thumb is 15-17,000 sf per acre assuming that all of it is buildable. In your part of the country, there are quite often issues with the plasticity of the soils which will require much more substantial amounts of concrete for footer and foundations. I remember a project in Bryan that required hundreds of pilings driven down to the solid ground, so this is a factor that alters a 'normal price'.
What we have been seeing is for a decent facility that has a mix of climate-controlled units, fence, gate, keypad, paved drives, etc. is going to be in the mid $40-low 50 per sf. this is for a single story project. I am a partner on a single story with CC that we just recently got our costs on and it was in the low $60's per sf. If you go multi-story, it will be higher (no pun intended) but I doubt that you will be doing that said it is semi-rural. I am a partner in a large multistory that we opened this year and it was in the $80+ range. Just remember that the costs can vary wildly depending on some things that are out of your control and some things that are, such as average unit size (smaller the average size, the more expensive...your feasibility study will tell you what the unit mix should be) and how nice you make it to attract customer.s If you are the only one in the game, you may be able to get away with cutting corners, but when you aren't the only game in town anymore, you may be behind the 8 ball.
Your feasibility study will tell you what margins to expect, but the more you can lower expenses, obviously the better that they will be. One of the things to consider would be using Virtual Management. I can share some info with you on that if you are interested. it is different than other things out there. I have been in this industry for 25 years and I believe it is going to be the next big thing in our industry.
I have been involved in well over 100 million sf of new self-storage construction and will be happy to share any info that I can that I have learned over the years.
If you are serious about getting into self-storage, you may find that there are better areas to build and that you sell the land that you have now to build in a better/more logical location. Just food for thought!
you can check out our self-storage Knowledge Bank here:
https://www.liveoakbank.com/self-storage-loans/
There is a ton of useful info on there that you might enjoy and benefit from.