Son, i realize you probably live in a cute little "build it and they will come" fantasy land. It's adorable, it really is, and we need people like you, just not making fiscal decisions with our very sparse tax dollars, we have enough idiots spending our money as it is.
I'll try to make this simple, imagine you bought a house in NE Jxn 20 years ago, you paid $200k and have been renting it out for the past several years. In the meantime, the neighborhood/city has continuously degraded. It is getting harder and harder to rent it at a point where it is profitable, plus the house will soon need expensive repairs and upgrades. The house today may only be worth $150k, so do you pump more into, knowing (mostly due to location) it is not a desirable property and you won't ever get enough rent to remain in the black? No, you unload it for what you can get for it. Sometimes it may make sense to spend a little on it to increase the sales price, but you get rid of it as soon as you can. Say you own a similar house in Flowood or Madison (desirable locations), it may make sense to put a lot of money into it.