Towers come with own set of rules and regulations for fire, compliance, central mechanical, elevators, roofs, accessory rooms/office, and model units- this has been an amazing experience working on building new efficiencies, implementing CAPEX with large NOI drivers - VeryExciting to have walked the gauntlet on the tower apartment versus garden-style - Truly expanded knowledge and experience.

Corporations and others who rent dense commercial office space will emerge financially weaker, seeking efficiencies and armed with empirical data on how their workforce performs remotely – outside expensive leased office space.

How quickly and efficiently can I work in different trades, what small things can I do myself to reduce that time line, and what materials can I use to prevent this in the future. 

I think the biggest hurdle I had to overcome was being ok with “failure” - not financially (be conservative starting out unless you are really comfortable with risk) but in terms of “wasting” my time/energy/etc on a market or deal that didn’t pan out.

How do we convert the radiators to something that is more efficient while the tenants are still living in the units?  

Ask her what her pain points are, what areas she is struggling with, and try to make them more efficient.

If you are able to develop your system to operate efficiently, enough to generate regular revenue from wholesaling, that could ignite the growth of your buy-and-hold portfolio.

@Henri ParkerHi Henri,If you have the cash to buy and rehab the home, that is your most efficient route and the safest from the investment standpoint.

@Bjorn AhlbladI don't know how you can do that efficiently. 

Some utilities offer credits to landlords for energy-efficient appliances, HVAC equipment, and many other environmentally friendly upgrades, like low-flow faucets.