I love where you mind is at and how organized your post/plan is.

Quote from @Alex Ng: I plan to purchase a property with an executory contract.

Planning to start a complete home remodel (interior/exterior) on a home (currently 837 sq ft), kitchen and bathroom bump out, and add an additional bathroom. 

if not, how would you plan to pay that bridge loan off before the balloon comes due?

@Stuart Udis plan A was to reposition as small office and keep it that way.  

It depends on how long you plan on holding the property for.

Some investors prefer to start saving for these ASAP, while others plan to deal with them when they happen.The unknown is Maintenance costs, which are often dictated by how "hard" a tenant lives in a property.

By trade and training, I’m a marketing, finance, and strategy guy, but at heart, I’m an entrepreneur who loves working with people and building meaningful connections.Real estate has been a part of my life for as long as I can remember, and now I’m diving in to carve my own path. 

No one talks about 5 or 10 year Plans to make a Million in RE.

I would need to know more specs on the house but with material shortages It's difficult to say how much to budget. 80K-120K for full gut perhaps but unsure with lumber beings so expensive and shortages.I would plan 9 months of vacancy between the pain you will endure pulling permits & having your contractors show up everyday to complete the work & then final inspections to get a CO.