The way you pictured and described the basement unit is as having all stationary glass block windows with vents.  

We want to travel so we don't want to stop and become stationary: A.

yes they are MF, but if you dont own the stationary just the land then you would talk to your RE tax preparer on the difference for things like cross seg, depreciation, etc.

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You can use the Blumberg A-55 'New York Apartment Lease' these are standard forms that you can buy online or any stationary store (probably cheaper since they sell them loose)...I own two NY co-op rental and use it in both...another alternative if you work with an agent is using REBNY form which is very similar and would agent probably suggest with no charge to you.In addition I follow my old landlady (an RE Agent) practice of supplementing it with a rider (copied hers) in which I stress/modify/add term which are important for me (for example that tenant cannot Airbnb the apt).The co-op is a company which have their own interest which not necessarily align with yours...it just happen that sometime they allow you as a shareholder to sublet your unit.   

Unless there is something funny about TX, you can use the DBA on stationary, cards, contracts, etc as long as it is a validly registered DBA.

Upper right hand corner was the corner shower unit, this was a round sliding door, so the shower door does not swing into the bath; the stationary part of the glass was closer to the sink, and the sliding door was closer to the doorway.

Most attorney's can find a way to get you out of it if needed, even if it's only by a simple letter on his/her stationary. 

When it is stationary, is when it is losing value.

For a little more, they can even do bcard designs, stationary, etc.