Let me propose a few scenarios: First three buy and hold rentals.1.

There was some legislation enacted to curtail its manufacture and use, long before 1978.

You can also send your listing to agent by email.When selecting an agent - interview them, ask how many of this type homes have you sold - are you successful, how much did you earn last year - ask for a marketing proposal - where and when will you advertise, how many open houses - will you do a virtual video recording, what websites will you put the house on - will you hand delivery flyers in the neighborhood - will you send out post cards (home many?)

You're not going to propose on your first date.

I am also trying to think of a proposal where the current seller keeps the homes and I buy the land only.

It also helps to get involved with local landlord groups (GBAOMA, MAOMA, CMAOA, etc) who help stay on top of legislative issues and lobby to keep them aligned in our favor whenever possible.

Here's another link mentioned legislation introduced in Feb of this year on the topic.http://nlihc.org/press/releases/7507Doesn't seem likely that will make much headway in DC.Probably good to consult with a landlord/tenant attorney before taking any action.

@Frank Manning Please inbox @Tiana Wright she will get you a proposal. 

I like that list of questions @Eric Hyde proposed. 

However, there is a development (not re-development) plan  for the immediate neighborhood that it lies in, in which they are proposing zoning plans for each of the parcels in the area.