Outgoing cast iron pipe is more of a concern than newer white PVC pipe.

I'm a fan of just vinyl in general in rentals, as long as it's decent quality especially for dining room/breakfast room chairs.

Mind you on these I would use mini splits.secondly, would you recommend a barndomenium style, brick with vinyl siding, or all vinyl?

Basically instead of the flat bottom of a vinyl product you have a rubber waffle underneath and an interlocking zipper type connection.

Are vinyl and or laminate floors installed as a carpet replacement in 1 unit of a 4-plex considered repairs vs improvement?

I've been using all kinds of vinyl tile in rentals for many years.

And any particular thing to keep in mind when buying the vinyl planks?

. - These are the years you have to worry about the most as many of these materials are coming to the end-of-their life as your purchasing today. 1980s - 2000s - PVC pipe, copper plumbing/wiring, slabs, etc. - these are more standard material today, and are more plentiful and are sometimes easier to replace as construction got better. - I'm not actually a fan of the newer builds as everything isn't built to last and a burst pipe, strong weather, meth-head who sells copper, etc. can do catastrophic damage more easily.

The 2nd and 3rd floor needs rehab work including, - Full Painting Flooring (Vinyl/Linoleum)- Replace Kitchen cabinets- Renovate the Bathrooms (replace tiles)- Drop a wall and make a corridor- Electrical throughout My question is, do I need to apply for a permit for all of this work?

They monitor the meters remotely, and send you and the resident a statement on the 1st of each month with the resident’s W/S/T usage and charges for the previous month.I use their Model TSN1 - PVC Meter which currently costs $95 each.Each building also needs at least one router which currently costs $195.If you have your meters in a centralized location, you only need one router but if the meters are scattered throughout the building, you may need multiple .There’s a monthly $6 fee per unit for the monitoring and invoicing.If you decide to give it a try, feel free to use discount code msam10 for a 10% discount.If you have any questions or comments feel free to reach out to me directly.And if you need to buy a building to put Sub-Meters in, I’m happy to chat about that as well