Alot depends on material choice and design complexity. 

We used to do pet deposits, but now we collect a one-time "pet fee" upfront that is designated for damage repair and cleaning on the back end. 

Zoning change and a lot of design an lobbying.

We spent a total of just under 50k renovating the property, all new windows, interior including paint, flooring, updated plumbing, electrical, all completely renovated the interior including removal of popcorn ceilings, and all costmetic updates, cabinets, countertops, light fixtures.

To get a better idea of what your ideal build would cost, find a build you like on HAR and present that to a builder so they can see the pics (finishes/design etc) and with that particular square footage they can give you an idea of what it will cost.

We spent a total of just under 50k renovating the property, all new windows, interior including paint, flooring, updated plumbing, electrical, all completely renovated the interior including removal of popcorn ceilings, and all costmetic updates, cabinets, countertops, light fixtures.

Designed to prevent the ground from shifting.

you might have to basically take the entire interior down to the studs, perform mold remediation, reinsulate, new drywall, new wiring etc.  30k might not cover it.

We designed some, furnished and manage them.

We installed an interior French drain system in the basement, because we knew that the neighborhood is prone to water intrusion.