Not to mention they wrote of over $300k worth of taxes for me utilizing a cost segregation study. 

Cost segregation utilizes the MACRS approach.

Even something as simple as utilizing ChatGPT to speed up certain processes such as asking for generalized information on a market's demographics and immigration patterns can be useful and save a lot of time.

ALTA survey, utility survey, etc.$100k per building, I'd say not usually. 

Implementing water-saving initiatives is a smart way to reduce utility costs.

@Alecia Loveless is correct--tenants need access 24/7 to their electric service panel, water and heat, assuming those are individual utilities for each unit. 

As noted above, up to 50% of gross rental income normally gets eaten up by expenses (taxes, management fees, utilities, landscaping, repairs, capex, etc).

Any home you buy with $20,000 is likely going to be a fixer-upper, which means it can be heavy on repairs, turnover costs, vacancies, etc.

I underestimated utilities in my early years, so I ensure those are properly captured (electricity, gas, water and trash).

I talked to a modular home company in my area, and he said to build a 4 / 2.5 2200 square foot home would be 215k, and then foundation and utilities would be another 160k.