Converting a garage into an ADU, sure.

I don't know your area, so I can only write to my experiences in PA.You don't really convert your property to Section 8 (S8), but rather sign a lease with a tenant who happens to be funded by S8.

Possibly already permitted outbuildings that already have plumbing such as workshops, offices, etc might be able to be converted to an ADU at a cost that does not result in the cost being more than the value added.Building an ADU is a lot of work and can be a slow process.  

With a large portion of the incoming migration coming from international residents moving to the District, emphasizing improving and bringing back Washington D.C. sports teams to the city should create a strong desire for domestic residents to want to live near a fun, community engaging activity that is very relevant to those that live in and around the city.The District also has other programs it is running to make the District more attractive to live in outside of just working in the area, such as the Office to Anything program (Source) and the Housing in Downtown program (Source) which will incentivize developer through tax credits to convert office buildings into new construction housing and new construction retail properties, which should continue to attract more residents back to the area.D.C. also understands that with all of these big changes we have seen, the strategy and allocation of resources from the government moving forward should be reassessed to create a city that is adapting to the future trends to remain a safe and desirable place for residents to live.

He may be actually speaking about a "Wrap".Find out if actual ownership converts to youMake sure you have a title reportYou may want to pay for an appraisal and an inspectionMake sure you use an escrow company or an attorney to do the transaction Hi Ken!

In the event my landlord is interested in selling, I was wondering if I could add value in the short term by, say, converting part of the garage and/or covered porch into a bathroom and maybe a bedroom (currently 3 bed 1 bath).

So I get a ton of traffic from other investors copying my stuff without them converting into a lead right?

In case of default the promissory note converts to a performance deed and is recorded giving seller or heirs the right to reclaim the property. 

When most US investors are faced with the prospect of converting (lots of) USD to JPY, to buy properties in cash, that in depreciate in value (when contemplating resale) and face decreasing rents over time... you need something else to justify choosing Japan over the US.

The idea is to convert a multi-family building into condos; but not in the traditional sense where you separate pre-existing apartments into their own condos; but in a way where you combine the common areas of all of the apartments in that whole building, and turn the individual rooms within those apartments into condos themselves; thus transforming the hallways, kitchens, bathrooms, living rooms, dining rooms, porches, balconies into common areas of the condos.