New Cainey MUD is who decides if you can add spaces, but since it’s in the ETJ, if more than 5 units is added, it must go through city of Houston for approval.

Imagine you're like me, typically looking for tenants for low-income housing, nothing above $1000/month.Go past the questions you're asking about using social media to discover further undesirable characteristics about tenants to deny them and flip this on its head.

Doing so just because it fits the budget might attract the wrong kind of tenant and make the experience so undesireable that it would discourage future investment. 

Does yours have windows facing any undesirable things like a cemetery or close to a Church where you'll get ringing church bells every Sunday morning?

If would suggest finding a contractor familiar with improving the building envelope (air sealing and insulation) for buildings the vintage of yours as applying techniques used for modern construction on older buildings that were not designed to be bottle tight, may require additional measures to avoid inadvertent - and undesirable - outcomes.

I don't want to buy a dumpy place in an undesirable area because I can't afford anything else.

@Eddie Pfeifer, your concerns with debt load and that  being an undesireable feature of  the DST is well taken. 

That means the house is either over priced, outdated or in an undesirable area.

The notice to quit may be a decision on the part of the landlord to simply get rid of a undesirable tenant.

Clear as mud.