I agree, I would be very careful doing anything that is not permitted or allowed based on the zoning. 

Can you take it to the city to get it permitted?

As far as permits and renovations and ADU additions?

After reviewing the latest ordinances, reports, and city guidelines, here’s a summary of my findings as of 11/18/2024:Key FindingsPermit Types and Fees:Type 1 (Owner-Occupied): $300 for 3 years.Type 2 (Non-Owner-Occupied): $450 for 3 years.Density caps apply to Type 2 permits (12.5% of block face).Enforcement:3 violations in 3 years lead to permit revocation.Fines up to $500/day for violations.Hotel Occupancy Tax (HOT):City: 9%, County: 1.75%, State: 6%.Platforms like Airbnb and VRBO will remit directly to the city starting Feb 2025.Platform Obligations:STRs must have valid permits; unpermitted properties will be removed by platforms like Airbnb.Special Exceptions for Density Limits:Require approval by the Board of Adjustment (BOA).Zip Code BreakdownI focused on these 11 zip codes:Under San Antonio Rules:78205, 78204, 78215, 78210, 78212, 78245, 78258Independent Municipalities (Separate Rules):Alamo Heights (78209)Leon Valley (78238)Helotes (78023)Next Steps:Research density caps and zoning in specific zip codes.Dive into independent municipality rules for Alamo Heights, Leon Valley, and Helotes.Evaluate market maturity and income potential using tools like AirDNA.If anyone has experience operating STRs in San Antonio or these specific zip codes, I’d love to hear your insights, especially about density limits, enforcement trends, or community sentiment.Thanks in advance!

All you're doing is finishing space and you should be able to go through normal permitting processes to get that done.  

Just keep thorough records of your expenses—materials, labor, permits, etc.

The economics do not allow for a property renovation, properly permitted and all deferred maintenance issues addressed.  

Defaults and Remedies A default exists under this note if (1) Borrower defaults in the payment of this note or in the performance of any obligation in any instrument securing or collateral to this note; (2) (a) Borrower or (b) any other person liable on any part of this note (an "Other Obligated Party") fails to timely pay or perform any obligation or covenant in any written agreement between Lender and Borrower or any Other Obligated Party other than as described in (1) above; (3) any representation in this note or in any other written agreement between Lender and Borrower or any Other Obligated Party is materially false when made; (4) a receiver is appointed for Borrower or an Other Obligated Party or any property on which a lien or security interest is created as security (the "Collateral Security") for any part of this note; (5) any Collateral Security is assigned for the benefit of creditors; (6) a bankruptcy or insolvency proceeding is commenced by Borrower, a partnership of which Borrower is a general partner, or an Other Obligated Party; (7) (a) a bankruptcy or insolvency proceeding is commenced against Borrower, a partnership of which Borrower is a general partner, or an Other Obligated Party and (b) the proceeding continues without dismissal for sixty days, the party against whom the proceeding is commenced admits the material allegations of the petition against it, or an order for relief is entered; (8) Borrower, a partnership of which Borrower is a general partner, or an Other Obligated Party is terminated, begins to wind up its affairs, or is authorized to terminate or wind up its affairs by its governing body or persons, or any event occurs or condition exists that permits the termination or winding up of the affairs of Borrower, a partnership of which Borrower is a general partner, or an Other Obligated Party; or (9) any Collateral Security is impaired by loss, theft, damage, levy and execution, issuance of an official writ or order of seizure, or destruction, unless it is promptly replaced with collateral security of like kind and quality or restored to its former condition.

Part of how the municipalities get you is pulling permits.

The building is typically zoned and permitted for short term rental use, so there's very little chance you'd ever be banned from doing short term rentals if they crack down in that market (like they are cracking down in my market).Cons: They typically charge 25% (in my market, at least).