Big Box, local hardware, plumbing supply? 

Get lines of credit on your two properties and supply a hard money lender with capital.

When they leave, you will need to re-rent at market price (which may be lower if the supply has recovered).I would not feel guilty charging a fair price to market in this situation. 

Thus I think for 2019 and 2020 we'll probably see that supply exceeds demand across most of the US, which will push prices back down.

I don't know enough about Portland, but yes Seattle is adding a lot of supply and is something to be aware of. 

He's helped out realtors and an investor with lawn service on their listed homes and also delivering supplies for a homebuilder, so he'll be happy to give you a free estimate and work with you too.

I like the Houston multifamily market, however, it's a little more challenging to navigate, and it looks like supply is ramping up there since the hurricane last year. 

I dont know much about  the supply and demand there but the demographics look good to me

The purpose of this section is to establish regulations governing accessory dwelling units, in compliance with California Government Code Section 65852.2, and to provide standards for the development of accessory dwelling units (ADUs) so as to increase the supply of smaller and affordable housing while ensuring that such units remain compatible with existing neighborhoods.B.

There's plenty of demand for houses $500k and below in town and not enough supply.