The manager doesn't speak English very well so talking to him is futile.

If anyone needs advice on anything to do with aviation (low flying planes, aircraft noise issues, etc) let me know, that's my speciality!!

I simply respond in proper English with a professional tone. 

They want to rent it.They speak very little English, but have a friend that can translate.

@Dawn Anastasi if I write into my business plan (not a non-profit, btw) some basic financial literacy counseling (Financial Peace Uni comes to mind, churches all over the nation do it in English and Spanish) as an offering for those buyers/sellers willing to take it, on MY dime, am I not improving the area by investing in the person? 

The students will speak decent English, too.

They will usually have a decent ability to speak English, but can find the process of renting, etc., a bit daunting and may not understand your American accent.  

All but one of these is usually visible and apparent on your first meeting, i.e. a landlord could assume an applicant wearing a hijab is of the Muslim faith, or someone of darker skin tone is of ethnic descent, or a person who walks with a cane or is wheelchair-bound has a disability, or a person who speaks Spanish fluently (or conversely doesn't speak English well) is of Hispanic or Latin or non-American descent, or a woman is, well, a woman.

We have written policies that are addressed within the lease but are included as an informational sheet for properties written in plain english.

Poor English speaking tenants that would give money orders not filled out because they couldn't spell so she would fill in after they left and make out to herself.