You'd probably need a couple holes per block, and It'd likely be as labor intensive as having a mason re-lay the block wall with rebar and concrete, but you'd be paying cheap unskilled labor instead of a mason, and you wouldn't have as much work on the front and tail end with jacking up your structure.To be honest I've never pumped in concrete with this method but I feel confident with a little resourcefulness you can come up with a good solution there. 

Then you then have 2 options. (1) is to take @Ian Ippolito's strategy of maximum risk reduction without worrying about mental energy, this will create the best investment outcomes. (2) is to try to optimize time/effort/energy-adjusted-risk, which can be appropriate for people who are looking for a passive experience, and maybe is appropriate for you. 

I knew there wasn't a way for the same amount of growth with my day job, which back then was labor intensive and entirely dependent on me.My "Why" as of late has been to build a successful business that's bigger than me and not only serves to benefit me into my retirement but also to benefit our investors, staff, and community.

I know locally we have new development clients pursuing office actively still, but they are adjusting to bio-tech type spaces with the office.

Namely, the adjustable rate.... 

The communication the tenant provides can show their commitment & responsibility.Consider the labor intensity it will take to run a particular property.

Adjust it for other obvious things, new gutters, a driveway, etc.

Adjust for knowledge of what the expenses would be (i.e. older properties have more expenses, taxes are higher/lower in certain states).

Focus on demand over the next 5-10 years, then adjust as needed.Cheers,Chad

I have a single family rental right now.Vacancy adjusted, I bring in $21,000 a year in rent.My annual expenses are:Property tax: $3200Insurance $900Washing machine $500Plumbing repair $250Irrigation turn on and turn off (I do myself, but otherwise it would be about $150.Total $5,000