@Suraj Nagrani I live in McAllen (8 yrs now), Laredo before that (8 yrs), San Diego for college and born and raised in El Paso. So I've pretty much lived & worked on the border my entire life. Things have changed in the last 10 yrs or so with not so many regular people crossing the bridge into Mexico - used to be we'd all go across for dinner and shopping but not so much anymore. My family's bread and butter has been industrial warehousing and real estate (my husband has a commercial firm that specializes in those properties) and the flow of international trade and related industry has not slowed. Business is as good as it's ever been.
It is true due to the increased crime activity in Mexico, there has been a huge Mexican National influx just as @Jeff Greenberg commented. It's dramatically boosted the economy on the US side. But that's not really where you will get your renters. I think the prospects for a large renter pool down here is positive for a variety of reasons - lower credit scores, lack of built up cash reserves for a down payment, difficulties securing a mortgage - just to name a few. The new medical school (part of the UT system) should bring another wave of renters. Plus we have a lot of Border Patrol and other government agency employees who come in and out of the area.
Lastly, I don't live in fear of drug cartels or the any run off violence. My kids play in my neighborhood and people are out exercising after dark. Restaurants are PACKED as is the mall. In fact, La Plaza Mall is reported to be one of the higher grossing malls in sales per sq ft. - always a zoo.
I'd be more than happy to meet you for a coffee (we even have Starbucks - lots of them in fact) to give you more of a feel for neighborhoods and the trends as I see them. I'm looking to add more SFH or MFH to our portfolio also so I can share with you what I've found. Just send me a message!
PS As @Pavel Reyes Valdes mentioned, it is hot here - still - ugh