This deal has a lot of components to it. After a quick read, I think this might have some potential IF you can carve out some of the components.
Personally, I wouldn't care about the excess land. Not where there is 17 acres of it. As Joel stated, construction money is scarce these days. Unless you can obtain LIHTC and/or can obtain a HUD 221(d)4 loan, funding the construction of the remaining units could be a real challenge. You might be better of carving out the land and selling it off. Is that possible?
Same thing goes for the storage units. It is now easier to obtain an SBA loan for self-storage businesses so these properties are now easier to market. Of course, since this property is incomplete it is going to present a challenge for anyone in need of funds, but it'll be easier for a seasoned owner of this property type to obtain the financing needed then it will be for you to (I'm going out on a limb here by assuming you aren't an experienced SS owner). Especially, if the buyer owns other income producing properties that can cover the debt.
Anytime a lender is motivated to sell a property it opens the door for creative solutions. The property may be a good deal, but not for one buyer. Not unless you're very liquid. For me, there's too much risk based on the amount of vacant land and another unfinished property. Obtaining the funds to bring the entire property up to its potential is likely to be prohibitive for one entity to handle.
If you can break the property up you can not only capture revenue from the sale of those properties, but you also don't have to worry about the headache of trying to obtain the funds to build/complete them.
Just an idea.