.: Hello, from what I've read online and confirmed by an attorney regarding emotional support animals - a legitimate ESA letter from a licensed mental health professional to receive housing protections under the Fair Housing Act is valid.My tenants provided a registration certificate from usserviceanimals - I do not see a signature other than the chairman of this website.

I do charge a one time nonrefundable fee of $450 per pet.

I also don’t charge extra pet deposits or pet rents and this makes my rentals super desirable to people.  

They're willing to pay any additional fees, but if they're service animals, my understanding is I cannot charge them any fees or pet rent.From what I've gathered, I can ask for a letter from a healthcare provider that the tenant was "prescribed" a service animal for a disability, but they do not have to disclose what the disability is, nor am I permitted to ask for specifics regarding the diagnosis.

The total might be $3300.They're charging the students around $4200.So they're making around $900/mo, or $450 per bedroom..My house:I have 6 bedrooms, so the company could potentially take in $12,500 per month from the students.Let's say I provide furniture and utilities, If they want to make $450 profit per bedroom, at 6 bedrooms, that's $2,700 ($450x6). 

You might not be looking at renting all these bedrooms at what you intend to charge but I don't know your area.  

Quote from @James McGovern: Listing agents who charge more don't often provide a better outcome compared to agents who have rock bottom listing fees.

I’m running the math carefully using FHA loan terms (~6.75%, 3.5% down), and I’m trying not to let emotion get in the way.

Chasing emotion is how one goes bankrupt. 

Evicting occupants from a house purchased through foreclosure can be a complex and emotionally challenging process.