I've done a fair share of research but I could use the collective experience of BP.They guy is paying far under market rent, he has 10 broken lawn mowers in the back yard, one disabled car in the front yard, has let the bathroom floor rot, and the siding partially fall off....

How someone can guarantee a tenant is beyond me; I guarantee we will place a qualified tenant, but life happens to tenants that are beyond my control such job loss, divorce, disability, lose their mind, marriage, job transfer, disappear, etc.  

It's true you can't ask about the nature of their disability.

Section 1101.652(b), Occupations Code, is amended to read as follows: (b) The commission may suspend or revoke a license issued under this chapter or take other disciplinary action authorized by this chapter if the license holder, while engaged in real estate brokerage: (1) acts negligently or incompetently; (2) engages in conduct that is dishonest or in bad faith or that demonstrates untrustworthiness; (3) makes a material misrepresentation to a potential buyer concerning a significant defect, including a latent structural defect, known to the license holder that would be a significant factor to a reasonable and prudent buyer in making a decision to purchase real property; (4) fails to disclose to a potential buyer a defect described by Subdivision (3) that is known to the license holder; (5) makes a false promise that is likely to influence a person to enter into an agreement when the license holder is unable or does not intend to keep the promise; (6) pursues a continued and flagrant course of misrepresentation or makes false promises through an agent or sales agent, through advertising, or otherwise; (7) fails to make clear to all parties to a real estate transaction the party for whom the license holder is acting; (8) receives compensation from more than one party to a real estate transaction without the full knowledge and consent of all parties to the transaction; (9) fails within a reasonable time to properly account for or remit money that is received by the license holder and that belongs to another person; (10) commingles money that belongs to another person with the license holder's own money; (11) pays a commission or a fee to or divides a commission or a fee with a person other than a license holder or a real estate broker or sales agent licensed in another state for compensation for services as a real estate agent; (12) fails to specify a definite termination date that is not subject to prior notice in a contract, other than a contract to perform property management services, in which the license holder agrees to perform services for which a license is required under this chapter; (13) accepts, receives, or charges an undisclosed commission, rebate, or direct profit on an expenditure made for a principal; (14) solicits, sells, or offers for sale real property by means of a lottery; (15) solicits, sells, or offers for sale real property by means of a deceptive practice; (16) acts in a dual capacity as broker and undisclosed principal in a real estate transaction; (17) guarantees or authorizes or permits a person to guarantee that future profits will result from a resale of real property; (18) places a sign on real property offering the real property for sale or lease without obtaining the written consent of the owner of the real property or the owner's authorized agent; (19) offers to sell or lease real property without the knowledge and consent of the owner of the real property or the owner's authorized agent; (20) offers to sell or lease real property on terms other than those authorized by the owner of the real property or the owner's authorized agent; (21) induces or attempts to induce a party to a contract of sale or lease to break the contract for the purpose of substituting a new contract; (22) negotiates or attempts to negotiate the sale, exchange, or lease of real property with an owner, landlord, buyer, or tenant with knowledge that that person is a party to an outstanding written contract that grants exclusive agency to another broker in connection with the transaction; (23) publishes or causes to be published an advertisement [, including an advertisement by newspaper, radio, television, the Internet, or display,] that: (A) misleads or is likely to deceive the public; (B) [,] tends to create a misleading impression; (C)implies that a sales agent is responsible for the operation of the broker's real estate brokerage business; [,] or (D) fails to include [identify] the name of the broker for whom the license holder acts, which name may be the licensed name, assumed name, or trade name of the broker as authorized by a law of this state and registered with the commission [person causing the advertisement to be published as a licensed broker or agent]; (24) withholds from or inserts into a statement of account or invoice a statement that the license holder knows makes the statement of account or invoice inaccurate in a material way; (25) publishes or circulates an unjustified or unwarranted threat of a legal proceeding or other action; (26) establishes an association by employment or otherwise with a person other than a license holder if the person is expected or required to act as a license holder; (27) aids, abets, or conspires with another person to circumvent this chapter; (28) fails or refuses to provide, on request, a copy of a document relating to a real estate transaction to a person who signed the document; (29) fails to advise a buyer in writing before the closing of a real estate transaction that the buyer should: (A) have the abstract covering the real estate that is the subject of the contract examined by an attorney chosen by the buyer; or (B) be provided with or obtain a title insurance policy; (30) fails to deposit, within a reasonable time, money the license holder receives as escrow or trust funds in a real estate transaction: (A) in trust with a title company authorized to do business in this state; or (B) in a custodial, trust, or escrow account maintained for that purpose in a banking institution authorized to do business in this state; (31) disburses money deposited in a custodial, trust, or escrow account, as provided in Subdivision (30), before the completion or termination of the real estate transaction; (32) discriminates against an owner, potential buyer, landlord, or potential tenant on the basis of race, color, religion, sex, disability, familial status, national origin, or ancestry, including directing a prospective buyer or tenant interested in equivalent properties to a different area based on the race, color, religion, sex, disability, familial status, national origin, or ancestry of the potential owner or tenant; or (33) disregards or violates this chapter.

Now she filed with fair housing that upstairs tenants were bothering her disability (which she never noticed office of any disability) and we discriminated for race since management is Asian.  

Don't say you're a disabled Vietnam Vet if you're not.

@John Powell - I'm a disabled Army vet myself :-) If you have any experience in Electrical, that would be the route I would go if I had to pick another field (electrical contractor).

I'm somewhat against both of these ideas because its and established neighborhood of $115-$135k houses and I'm not sure I'd be able to make much of a profit on these.My last idea would be to try and find some sort of grant to build long term housing to build 2 houses that meet the specific needs of either individuals with special needs or perhaps disabled or homeless vets? 

"May a housing provider charge an extra fee or require an additional deposit from applicants or residents with disabilities as a condition of granting a reasonable accommodation?

Their point is that some populations such as retirees, the disabled, sufferers of mental illness, etc. are willing to spend a greater proportion of their income on housing (their documents online explain this reasoning).