So at retirement time, it seems the the LLCs could all be amended to name me as the single member.  

Again, you will pay for the drainage construction and all legal costs for amending the easement. 

If she qualifies great - either a new lease with just her or an amendment to an existing one.

You need to see the rules and regulations and amended CCR in addition to the original recorded CCR.

If I drop the rent for side B down to $1000 (or less), what are your thoughts on amending the contract for side a to drop their rent to match and refund the corresponding amount from their security deposit? 

If the CC&R’s currently do not restrict the rental of property2 and the HOA seeks to amend its CC&R’s to include such provisions, they may do so, but it will require a statutorily higher vote count of the unit owners.3See information sources:1Senate Bill 1350: Online Lodging; Administration; Definitions2A.R.S. 33-1260.01.

They must not be defective due to dampness or otherwise.The landlord must ensure that electricity or gas supplies are safe and in good repair, and that every room has adequate ventilation and both natural and artificial lighting.Laundry, food preparation and food storageArticle 8 of the 2008 Regulations (as amended) requires private landlords to provide access to: A washing machineA clothes-dryer if the dwelling does not have a private garden or yardThey must also provide facilities for cooking and for the hygienic storage of food, to include the following: 4-ring hob with oven and grillCooker hood or extractor fanFridge and freezer, or a fridge-freezerMicrowave ovenKitchen cupboards that are suitable and adequate for storing foodSink with mains water supply, hot water and draining areaFor dwellings rented from local authorities and approved housing bodies, the relevant requirements are in Article 7 of the Housing (Standards for Rented Houses) Regulations 1993.

If one investor could drop 100m on a deal they have the weight to add stipulations or amendments to the syndication deal vs a Mom & Pop with $50k to invest. 

Generally, the couple must Divorce, obtain an Annulment, or agree to amend the title to the property to extinguish a tenancy by the entirety.

They will however amend the agreement or it's a new agreement to extend the 10 years.