(I can see that @McKinley Carbone voted your post up, so it seems like you are going to get the attention of tons of marketers, who, like Michael Quarles are not allowed to self promote without breaking the forum rules.)Unlike the companies you've mentioned in your post, most of the marketers here focus on one thing: Real Estate.

This is especially true if you are using a carbon copy of a letter offered by a service.  

@Adriel HsuDude, you killed it.Your first project is almost a carbon copy of my first project.  

The kitchen is full of old moldy food and nasty gunk everywhere including inside the dishwasher, walls from top to bottom just dirty and sticky, with wax etc. all over everything, Every smoke detector, carbon monoxide monitor pulled of the wall, trash stuffed down the bathroom drains, 100s of holes in the walls and ceiling (her stripper poles) etc., Just gross.  

Prior to my tenants moving in, I give them a welcome letter which also has the following information:- Copies of their lease agreement, and any other addendums they signed- The names and phone numbers to call to start utility service- Information on watering days (if applicable, because some of my properties are located in areas that can only be watered on certain days/times) and trash pickup days- Information on gardening service (if provided/applicable, I tell them who will be coming and on what days)- Location of furnace filters, size of replacements, and recommended changing intervals- Nearest schools- Information on renters insurance (I don't require it, but I give them info on it in case they choose to get it)- Location of the smoke detectors and carbon monoxide detectors, along with recommended changing intervals for the batteries- Any other unique information about the specific property/neighborhood itself that I feel is important for them to knowI also provide them USPS address change cards for their convenience since I figure they'll have a lot to be worrying about during their move.As far as the water heaters go, I don't really want them messing with it after I set it so I don't provide any specific information on it.

i'm finding it hard to keep abreast of the most recent interpretation of the ongoing CO and smoke alarm rules as applicable to all units in CA, whether owner occupied, multifamily, mixed used, commercial, etc.my area ...

I would also include in the lease the need for bi-annual inspections of the unit (I call them safety inspections to check smoke detectors, carbon monoxide detectors are working, for example).- Resolve to always act like the professional you are.

I would also look to connect with @Kevin Carbon, @Tiffany Plovie, @Troy Fisher.

Hot water tank (check for leaks), furnace, smoke and carbon monoxide detectors all confirmed to be working properly.

I do have specific language about them being responsible for plumbing issues, not going on the roof, maintaining the yard, maintaining smoke/carbon detectors, etc, etc.